Document:

<PAGE>
                                                                     EXHIBIT 4.1

                          REGISTRATION RIGHTS AGREEMENT

                                  BY AND AMONG

                       SCHLUMBERGER TECHNOLOGY CORPORATION

                                       AND

                               GRANT PRIDECO, INC.

                                DECEMBER 20, 2002

<PAGE>

                          REGISTRATION RIGHTS AGREEMENT

                  REGISTRATION RIGHTS AGREEMENT dated as of December 20, 2002,
among Grant Prideco, Inc., a Delaware corporation (the "Company"), Schlumberger
Technology Corporation, a Texas corporation ("Seller").

                                   WITNESSETH:

                  WHEREAS, pursuant to a Purchase Agreement, dated as of October
25, 2002 (the "Purchase Agreement"), by and among the Company and the Holders
(as hereafter defined), the Holders acquired 9,731,834 shares of Common Stock
(as hereafter defined).

                  WHEREAS, the parties hereto desire to set forth the rights of
the Holders (as hereinafter defined) and the obligations of the Company with
respect to the registration of the Registrable Securities (as hereafter defined)
pursuant to the Securities Act (as hereafter defined); and

                  WHEREAS, the execution and delivery of this Agreement by the
parties hereto is a condition to the obligations of each of the Holders and the
Company under the Purchase Agreement;

                  NOW, THEREFORE, in consideration of the covenants and
agreements of the Holders and the Company contained herein and in the Purchase
Agreement and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

     Capitalized terms used but not otherwise defined herein shall have the
meanings assigned to such terms in the Purchase Agreement. For purposes of this
Agreement the following terms shall have the following meanings:

         Section 1.1 Affiliate. "Affiliate" of any Person means any entity that
controls, is controlled by, or is under common control with such Person. As used
herein, "control" means the possession, directly or indirectly, of the power to
direct or cause the direction of the management and policies of such entity,
whether through ownership of voting securities or other interests, by contract
or otherwise.

         Section 1.2 Common Stock. "Common Stock" means the shares of common
stock, par value $0.01 per share, of the Company.

         Section 1.3 Continuously Effective. "Continuously Effective," with
respect to a specified Registration Statement, means that such Registration
Statement shall not cease to be effective and available for transfers of
Registrable Securities in accordance with the method of

<PAGE>

distribution set forth therein during the period specified, subject to
applicable blackout periods, in the relevant provision of this Agreement.

         Section 1.4 Exchange Act. "Exchange Act" means the Securities Exchange
Act of 1934, as amended from time to time, and the rules and regulations
thereunder.

         Section 1.5 Holders. "Holders" means, collectively, Seller and its
affiliates (other than the Company) who from time to time own Registrable
Securities or any transferee of a Holder entitled to the benefits of this
Agreement; each of such entities separately is sometimes referred to herein as a
"Holder."

         Section 1.6 Maximum Number. "Maximum Number" when used in connection
with an underwritten offering, shall mean the maximum number of shares of Common
Stock (or amount of other Registrable Securities) that the Underwriters'
Representative has informed the Company and the Holders may be included as part
of such offering without materially and adversely affecting the success or
pricing of such offering.

         Section 1.7 Person. "Person" shall mean any natural person, firm,
individual, corporation, partnership, limited liability company, joint venture,
business trust, association, trust, company or other organization or entity,
whether incorporated or unincorporated.

         Section 1.8 Prospectus. "Prospectus" means the prospectus included in a
Registration Statement, as amended or supplemented by any prospectus supplement
with respect to the terms of the offering of any portion of the Registrable
Securities covered by such Registration Statement and by all other amendments
and supplements to the prospectus, including post-effective amendments and all
material incorporated by reference in such prospectus.

         Section 1.9 Purchase Agreement. "Purchase Agreement" has the meaning
set forth in the recitals of this Agreement.

         Section 1.10 Registrable Securities. "Registrable Securities" means,
collectively, (i) the shares of Common Stock acquired by the Holders pursuant to
the Purchase Agreement (the "Shares"), (ii) any stock or other securities (of
the Company or any other issuer) into which or for which the Shares may
hereafter be changed, converted or exchanged, (iii) any other securities issued
or distributed in respect of the Shares by way of stock dividend or stock split
or in connection with a combination of shares, recapitalization, reorganization,
merger, consolidation or otherwise, and (iv) any other successor securities
received in respect of any of the foregoing (i) through (iii).

         Section 1.11 Registration Expenses. "Registration Expenses" means any
and all out-of-pocket expenses incident to performance of or compliance with
this Agreement, including, without limitation, (i) all SEC and securities
exchange registration and filing fees, (ii) all fees and expenses of complying
with securities or blue sky laws (including fees and disbursements of counsel
for any underwriters in connection with blue sky qualifications of the
Registrable Securities) or relating to the National Association of Securities
Dealers, Inc. (the "NASD"), (iii)

                                       2
<PAGE>

all printing, messenger and delivery expenses, (iv) all fees and expenses
incurred in connection with the listing of the Registrable Securities on any
securities exchange pursuant to Section 7(h), (v) the fees and disbursements of
counsel for the Company and of its independent public accountants, (vi) all
expenses in connection with the preparation, printing and filing of the
Registration Statement, any preliminary Prospectus or final Prospectus and
amendments and supplements thereto and the mailing and delivering of copies
thereof to any Holders, underwriters and dealers and all expenses incidental to
delivery of the Registrable Securities, (vii) subject to the limitations set
forth in Section 8, the reasonable fees and disbursements of counsel, other than
the Company's counsel, selected by the Holders of the Registrable Securities
being registered, (viii) the reasonable fees and expenses of any special experts
retained in connection with the requested registration, (ix) any internal
expenses of the Company and cost of Company employees, (x) the expenses incurred
in connection with making "roadshow" presentations and holding meetings with
potential investors to facilitate the distribution and sale of Registrable
Securities, but shall not include with respect to Registrable Securities sold by
the Holders (a) underwriting discounts and commissions and transfer taxes, if
any, and (b) any fees and disbursements of underwriters customarily paid by the
issuers or sellers of securities.

         Section 1.12 Registration Statement. "Registration Statement" means any
registration statement of the Company which covers Registrable Securities
pursuant to the provisions of this Agreement, including the Prospectus,
amendments and supplements to such registration statements including
post-effective amendments, and all exhibits and all material incorporated by
reference in such Registration Statement.

         Section 1.13 Related Securities. "Related Securities" means any
securities of the Company similar or identical to any of the Registrable
Securities including, without limitation, Common Stock and all options,
warrants, rights and other securities convertible into, or exchangeable or
exercisable for Common Stock (other than any of the foregoing to be offered or
sold to officers, directors or employees as compensation).

         Section 1.14 Securities Act. "Securities Act" means the Securities Act
of 1933, as amended from time to time, and the rules and regulations thereunder.

         Section 1.15 SEC. "SEC" means the Securities and Exchange Commission.

         Section 1.16 Underwritten Registration or Underwritten Offering.
"Underwritten Registration or Underwritten Offering" shall mean a registration
in which securities of the Company are sold to one or more underwriters for
reoffering to the public.

         Section 1.17 Underwriters' Representative. "Underwriters'
Representative" when used in connection with an Underwritten Offering, shall
mean the managing underwriter of such offering, or, in the case of a co-managed
underwriting, the managing underwriter designated as the Underwriters'
Representative by the co-managers.

                                       3
<PAGE>

                                   ARTICLE II

                      SECURITIES SUBJECT TO THIS AGREEMENT

     The securities entitled to the benefits of this Agreement are the
Registrable Securities. For the purposes of this Agreement, Registrable
Securities will cease to be Registrable Securities when (i) a Registration
Statement covering such Registrable Securities has been declared effective under
the Securities Act and they have been disposed of pursuant to such effective
Registration Statement, (ii) such Registrable Securities are distributed to the
public pursuant to Rule 144 (or any similar provision then in force) under the
Securities Act, or (iii) such Registrable Securities shall have ceased to be
outstanding.

                                   ARTICLE III

                      REGISTRATION UNDER THE SECURITIES ACT

         Section 3.1 Required Registration.

                           (a) The Company shall file a "shelf" registration
statement with the SEC covering all of the Registrable Securities (the "Shelf
Registration Statement") as soon as practicable and in no event more than 30
days after the Closing Date and the Company shall use its commercially
reasonable efforts to have such Shelf Registration Statement declared effective
by the SEC as soon as practicable thereafter, but in no event later than the
120th day after the Closing Date. The Company agrees to use its commercially
reasonable efforts to keep such Shelf Registration Statement Continuously
Effective until such time as (i) all of the Registrable Securities have been
sold by the Holders or (ii) this Agreement terminates in accordance with Section
11.3, including, if necessary, by filing with the SEC a post-effective amendment
or a supplement to the Shelf Registration Statement or the related prospectus or
any document incorporated therein by reference or by filing any other required
document or otherwise supplementing or amending the Shelf Registration
Statement, if required by the rules, regulations, or instructions applicable to
the registration form used by the Company for such Shelf Registration Statement
or by the Securities Act, the Exchange Act, any state securities or blue sky
laws, or any rules and regulations thereunder.

                           (b) In addition, if for any reason, the Shelf
Registration Statement is not kept Continuously Effective, in addition to any
other claims the Holders may have for breach of contract, the Holders shall have
the right to request in writing (a "Request") (which Request shall specify the
Registrable Securities intended to be disposed of by such Holders and the
intended method of distribution thereof, which may include sales for cash or
dispositions upon exchange or conversion of securities or dispositions for any
form of consideration or no consideration) that the Company register such
portion of such Holders' Registrable Securities as shall be specified in the
Request (a "Demand Registration") by filing with the SEC, as soon as

                                       4
<PAGE>

practicable thereafter, but not later than the 30th day after the receipt of
such a Request by the Company, a registration statement (a "Demand Registration
Statement") covering such Registrable Securities, and the Company shall use its
commercially reasonable efforts to have such Demand Registration Statement
declared effective by the SEC as soon as practicable thereafter, but in no event
later than the 120th day after the receipt of such a Request. The Company agrees
to use its commercially reasonable efforts to keep such Demand Registration
Statement Continuously Effective for the period specified in the Request, as
extended by the length of any Suspension Period (as defined in Section 7) with
respect thereto (or for such shorter period which will terminate when all of the
Registrable Securities covered by such Demand Registration Statement shall have
been sold pursuant thereto), including, if necessary, by filing with the SEC a
post-effective amendment or a supplement to the Demand Registration Statement or
the related prospectus or any document incorporated therein by reference or by
filing any other required document or otherwise supplementing or amending the
Demand Registration Statement, if required by the rules, regulations or
instructions applicable to the registration form used by the Company for such
Demand Registration Statement or by the Securities Act, the Exchange Act, any
state securities or blue sky laws, or any rules and regulations thereunder;
provided that such period during which the Demand Registration Statement shall
remain Continuously Effective shall, in the case of an Underwritten Offering, be
extended for such period (if any) as the underwriters shall reasonably require,
including to satisfy, in the judgment of counsel to the underwriters, any
prospectus delivery requirements imposed by applicable law.

                  The Company shall not be obligated to effect more than three
(3) Demand Registrations pursuant to Requests. For purposes of the preceding
sentence, a Demand Registration shall not be deemed to have been effected, (i)
unless a Demand Registration Statement with respect thereto has become
effective, (ii) if after such Demand Registration Statement has become
effective, the offer, sale or distribution of Registrable Securities thereunder
is prevented by any stop order, injunction or other order or requirement of the
SEC or other Governmental Entity for any reason not attributable to any Holder
and such effect is not thereafter eliminated, or (iii) if the conditions to
closing specified in the underwriting agreement entered into in connection with
such Registration are not satisfied or waived, other than by reason of a failure
on the part of any Holder. If the Company shall have complied with its
obligations under this Agreement, a right to a Demand Registration pursuant to
this Section 3(a) shall be deemed to have been satisfied upon the earlier of (x)
the date as of which all of the Registrable Securities included therein shall
have been sold or distributed pursuant to the Demand Registration Statement, and
(y) the date as of which such Demand Registration shall have been Continuously
Effective for the period specified in the preceding paragraph following the
effectiveness of such Demand Registration Statement.

                  Any Request made pursuant to this Section 3.1 shall be
addressed to the attention of the Secretary of the Company, and shall specify
(a) the number of Registrable Securities to be Registered, (b) the intended
method of distribution thereof and the requested period of effectiveness, and
(c) that the request is for a Demand Registration pursuant to this Section 3(a).

                           (c) The Company may not include in a Demand
Registration pursuant to Section 3.1 hereof, shares of Common Stock for the
account of the Company or any subsidiary of the Company, but, if and to the
extent required by a contractual obligation existing on the date hereof, may,
subject to compliance with Section 3.1(d), include shares of Common Stock for
the account of any other Person who holds shares of Common Stock entitled to be
included therein; provided, however, that, except to the extent modified with
the consent of the

                                       5
<PAGE>

Holders, if the Underwriters' Representative of any offering described in this
Section 3.1 shall have informed the Holders in writing that in its judgment
there is a Maximum Number of shares of Common Stock that all Holders and any
other Persons desiring to participate in such Registration may include in such
offering, then the Company shall include in such Demand Registration all
Registrable Securities requested to be included in such Registration by the
Holders together with up to such additional number of shares of Common Stock
that any other Persons entitled to participate in such Registration desire to
include in such Registration up to the Maximum Number that the Underwriters'
Representative has informed the Holders may be included in such Registration
without materially and adversely affecting the success or pricing of such
offering; provided that the number of shares of Common Stock to be offered for
the account of all such other Persons participating in such Registration shall
be reduced in a manner determined by the Company in its sole discretion.

                           (d) No Holder may participate in any underwritten
offering under Section 3.1 hereof and no other Person shall be permitted to
participate in any such offering pursuant to Section 3.1 hereof unless it
completes and executes all customary questionnaires, powers of attorney, custody
agreements, underwriting agreements, and other customary documents required
under the customary terms of such underwriting arrangements. In connection with
any underwritten offering under Section 3.1 hereof, each participating Holder
and the Company and each other Person shall be a party to the underwriting
agreement with the underwriters and may be required to make certain customary
representations and warranties and provide certain customary indemnifications
for the benefit of the underwriters; provided that the Holders shall not be
required to make representations and warranties with respect to the Company and
its Subsidiaries or their business and operations and shall not be required to
agree to any indemnity or contribution provisions less favorable to them than as
are set forth herein.

         Section 3.2 Incidental Registration.

                           (a) Notwithstanding the fact that all of the
Registrable Securities may be registered under the Shelf Registration Statement,
if at any time the Company proposes to register any Related Securities under the
Securities Act (other than in connection with any acquisition or business
combination transaction and other than in connection with stock options and
other stock-based employee benefit plans and compensation) either in connection
with a primary offering for cash for the account of the Company, a secondary
offering or a combined primary and secondary offering, the Company will each
time it intends to effect such a registration, give written notice (a "Company
Notice") to all Holders of Registrable Securities at least 20 business days
prior to the initial filing of a registration statement with the SEC pertaining
thereto, informing such Holders of its intent to file such registration
statement and of the Holders' right to request the registration of the
Registrable Securities held by the Holders. Upon the written request of the
Holders made within 15 business days after any such Company Notice is given
(which request shall specify the Registrable Securities intended to be disposed
of by such Holder and, unless the applicable registration is intended to effect
a primary offering of Common Stock for cash for the account of the Company, the
intended method of distribution thereof), the Company will use its commercially
reasonable efforts to effect the registration under the Securities Act of all
Registrable Securities which the Company has been so requested to register by
the Holders to the extent required to permit the disposition (in accordance with
the

                                       6
<PAGE>

intended methods of distribution thereof or, in the case of a registration which
is intended to effect a primary offering for cash for the account of the
Company, in accordance with the Company's intended method of distribution) of
the Registrable Securities so requested to be registered, including, if
necessary, by filing with the SEC a post-effective amendment or a supplement to
the registration statement filed by the Company or the related prospectus or any
document incorporated therein by reference or by filing any other required
document or otherwise supplementing or amending the registration statement filed
by the Company, if required by the rules, regulations or instructions applicable
to the registration form used by the Company for such registration statement or
by the Securities Act, any state securities or blue sky laws, or any rules and
regulations thereunder; provided, however, that if, at any time after giving
written notice of its intention to register any securities and prior to the
effective date of the registration statement filed in connection with such
registration, the Company shall determine for any reason not to register or to
delay such registration of the securities, the Company shall give written notice
of such determination to each Holder of Registrable Securities and, thereupon,
(A) in the case of a determination not to register, the Company shall be
relieved of its obligation to register any Registrable Securities in connection
with such registration (but not from its obligation to pay the Registration
Expenses incurred in connection therewith), and (B) in the case of a
determination to delay such registration, the Company shall be permitted to
delay registration of any Registrable Securities requested to be included in
such registration statement for the same period as the delay in registering such
other securities.

                  The registration rights granted pursuant to the provisions of
this Section 3.2 shall be in addition to the registration rights granted
pursuant to the other provisions of Article III.

                           (b) If, in connection with a Registration Statement
pursuant to this Section 3.2, the Underwriters' Representative of the offering
registered thereon shall inform the Company and the Holders in writing that in
its opinion there is a Maximum Number of shares of Common Stock that may be
included therein; then (a) in the event such Registration Statement relates to
an offering initiated by the Company of Common Stock being offered for the
account of the Company, the Company may include in such registration the number
of shares it proposes to offer and, if such number is less than the Maximum
Number, then the number of shares of Common Stock requested to be included by
any Person other than the Company (including the Holders) may be reduced, pro
rata in proportion to the respective number of shares of Common Stock owned by
such Persons, to the extent necessary to reduce the respective total number of
shares of Common Stock requested to be included in such offering to the Maximum
Number of shares of Common Stock recommended by such Underwriters'
Representative and (b) in the event such a Registration Statement is initiated
by any Person other than the Company, except to the extent modified with the
consent of the Holders, the number of shares of Common Stock requested to be
included by such Person and any other Person (including the Holders) may be
reduced pro rata in proportion to the respective number of shares of Common
Stock owned by such Persons, to the extent necessary to reduce the respective
total number of shares of Common Stock requested to be included in such offering
to the Maximum Number.

                                       7
<PAGE>

                                   ARTICLE IV

                                 BLACKOUT PERIOD

         Section 4.1 General. Subject to the provisions in Section 4.2, the
Company shall be entitled to elect that a Registration Statement not be usable,
or that the filing thereof be delayed beyond the time otherwise required, for a
reasonable period of time, but not in excess of 60 days (a "Blackout Period"),
if the Company determines in good faith that the registration and distribution
of Registrable Securities (or the use or filing of the Registration Statement or
related Prospectus) would interfere with any pending material financing,
acquisition, corporate reorganization or any other material corporate
development involving the Company or any of its subsidiaries or would require
premature disclosure thereof and promptly gives the Holders of Registrable
Securities written notice of such determination, and to the extent practicable
an approximation of the anticipated delay; provided, however, that the aggregate
number of days included in all Blackout Periods, when taken together with any
Suspension Periods (as defined in Section 7), during any consecutive 12 months
shall not exceed 90 days.

         Section 4.2 Specific Blackout Procedures. All Registrable Securities
sold or distributed under a Demand Registration shall be made in accordance with
the following provisions:

                           (a) Underwritten Offerings. With respect to an
Underwritten Offering, the provisions of Section 4.1 shall apply to the delaying
by the Company of (i) the filing of a Registration Statement and (ii) causing a
Registration Statement to become effective. Once an underwriting agreement as
contemplated by Section 7(i) has been entered into in connection with the
Underwritten Offering, the terms of such underwriting agreement and Section 3.1,
and not the provisions of Section 4.1, shall govern the continued effectiveness
and use of the Registration Statement as it relates to such Underwritten
Offering. However, if the underwriting agreement did not contain provisions for
blackout periods, Section 4.1 would continue to apply.

                           (b) Other Offerings. With respect to an offering
other than an Underwritten Offering, the procedures of this Section 4.2(b) shall
supplement Section 4.1 with respect to sales after the effectiveness of the
Registration Statement. The Holders can assume that there is not a Blackout
Period and that the Registration Statement is current unless they have received
a written notice to the contrary from the Company.

                                    ARTICLE V

                            SELECTION OF UNDERWRITERS

         If any offering pursuant to a Demand Registration Statement is an
underwritten offering, the Holders will select a managing underwriter or
underwriters to administer the offering, in its sole discretion after
consultation with the Company. In such event, the Company may select a
co-manager in its sole discretion after consultation with the Holders. In any
incidental registration pursuant to Section 3.2, the Company will select a
managing underwriter or

                                       8
<PAGE>

underwriters to administer the offering, in its sole discretion after
consultation with the Holders.

                                   ARTICLE VI

                               HOLDBACK AGREEMENT

                           (a) If so requested by the Underwriters'
Representative in connection with an offering of any Registrable Securities, the
Company shall agree not to effect any sale or distribution of shares of Common
Stock, without the prior written consent of the Underwriters' Representative
(other than as a part of such offering or in connection with any acquisition or
business combination transaction and other than in connection with stock options
and employee benefit plans and compensation) during the 7-day period prior to,
and during the 90-day period beginning on, the date such registration statement
is declared effective under the Securities Act by the SEC and shall use its
commercially reasonable efforts to obtain and enforce similar agreements from
any other Persons if requested by the Underwriters' Representative; provided
that the Company or such Persons shall not be subject to the restrictions set
forth in this Section 6(a) for longer than 97 days during any 12-month period.

                           (b) Notwithstanding anything else in this Section 6
to the contrary, no Holder shall be precluded from distributing to any or all of
its stockholders any or all of the Registrable Securities.

                           (c) As used in paragraphs (a) and (b) of this Section
6, "sales" or "distributions" shall be deemed to include, to the extent
requested by the Underwriters' Representative, (1) contracts to sell, sales of
options or contracts to purchase, purchases of any option or contract to sell,
grants of options, rights or warrants to purchase or otherwise transfer or
dispose of, directly or indirectly, any of the Shares or any securities
convertible into or exercisable or exchangeable for the Shares and (2) swaps or
other arrangements that transfer to another, in whole or in part, any of the
economic consequences of ownership of the Shares, whether any such transaction
described in clause (1) or (2) above is to be settled by delivery of the Shares
or such other securities, in cash or otherwise.

                                   ARTICLE VII

                             REGISTRATION PROCEDURES

         If and whenever the Company is required to or to use its commercially
reasonable efforts to effect or cause the registration of any Registrable
Securities under the Securities Act as provided in this Agreement, the Company
will, as expeditiously as possible and without limiting any time period or
obligation set forth elsewhere in this Agreement:

                           (a) Prepare and file with the SEC a Registration
Statement with respect to such Registrable Securities on a form for which the
Company then qualifies, and which form shall be available for the sale of the
Registrable Securities in accordance with the intended methods of distribution
thereof, and use its best efforts to cause such Registration Statement to become
and remain effective; provided that, a reasonable time before filing a

                                       9
<PAGE>

Registration Statement or Prospectus, or any amendments or supplements thereto
(other than reports required to be filed by it under the Exchange Act and the
rules and regulations adopted by the SEC thereunder), the Company will furnish
to the Holders and their counsel for review and comment, copies of all documents
proposed to be filed and provided further, that if the Holders so request, they
and their counsel and other representatives may participate in the drafting and
preparation of such Registration Statement;

                           (b) prepare and file with the SEC amendments and
post-effective amendments to each such Registration Statement and such
amendments and supplements to the Prospectus used in connection therewith as may
be required by the Securities Act or the Exchange Act or otherwise necessary to
keep the Registration Statement effective for the applicable period and cause
the Prospectus as so supplemented to be filed pursuant to Rule 424 under the
Securities Act, and to otherwise comply with the provisions of the Securities
Act with respect to the disposition of all securities covered by such
Registration Statement until such time as all of such securities have been
disposed of in accordance with the intended methods of disposition set forth in
such Registration Statement and Prospectus or such earlier time as the Company's
obligations to maintain the effectiveness and availability for use of such
Registration Statement ceases;

                           (c) furnish to each Holder of such Registrable
Securities such number of copies of such Registration Statement and of each
amendment and post-effective amendment thereto (in each case including all
exhibits), the Prospectus and Prospectus supplement, as applicable, and such
other documents as such Holder may reasonably request in order to facilitate the
disposition of the Registrable Securities by such Holder (the Company hereby
consenting to the use (subject to the limitations set forth in the last
paragraph of this Section 7) of the Prospectus or any amendment or supplement
thereto in connection with such disposition);

                           (d) use its commercially reasonable efforts to
register or qualify such Registrable Securities covered by such Registration
Statement under such other securities or blue sky laws of such jurisdictions as
each Holder shall reasonably request, and do any and all other acts and things
which may be reasonably necessary or advisable to enable such Holder to
consummate the disposition in such jurisdictions of the Registrable Securities
owned by such Holder, except that the Company shall not for any such purpose be
required to qualify generally to do business as a foreign corporation in any
jurisdiction where, but for the requirements of this Section 7(d), it would not
be obligated to be so qualified, to subject itself to taxation in any such
jurisdiction, or to consent to general service of process in any such
jurisdiction;

                           (e) notify each Holder of any such Registrable
Securities covered by such Registration Statement, at any time when a Prospectus
relating thereto is required to be delivered under the Securities Act within the
appropriate period mentioned in Section 7(b), of the Company's becoming aware
that the Prospectus included in such Registration Statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading, then
existing, and at the request of any such Holder, prepare and furnish to such
Holder a reasonable number of copies

                                       10
<PAGE>

of an amendment or supplement to the Registration Statement or related
Prospectus as may be necessary so that, as thereafter delivered to the
purchasers of such Registrable Securities, such Prospectus shall not include an
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading;

                           (f) notify each Holder of Registrable Securities
covered by such Registration Statement at any time,

                                    (i) when the Prospectus or any Prospectus
supplement or post-effective amendment has been filed, and, with respect to the
Registration Statement or any post-effective amendment, when the same has become
effective,

                                    (ii) of any request by the SEC for
amendments or supplements to the Registration Statement or the Prospectus or for
additional information, and of any comments, oral or written, by the SEC with
respect thereto,

                                    (iii) of the issuance by the SEC of any stop
order suspending the effectiveness of the Registration Statement or the
initiation of any proceedings for that purpose,

                                    (iv) if at any time the representations and
warranties of the Company made pursuant to agreements contemplated by paragraph
(i)(1) below cease to be true and correct, and

                                    (v) of the receipt by the Company of any
notification with respect to the suspension of qualification or exemption from
qualification of the Registrable Securities for offering or sale in any
jurisdiction or the initiation or threatening of any proceeding for such
purpose;

                           (g) otherwise use its commercially reasonable efforts
to make available to its security holders, as soon as reasonably practicable
(but not more than eighteen months) after the effective date of the Registration
Statement, an earnings statement which shall satisfy the provisions of Section
11(a) of the Securities Act and the rules and regulations promulgated
thereunder;

                           (h) cause all such Registrable Securities to be
listed on any securities exchange on which the Common Stock is then listed, if
such Registrable Securities are not already so listed and if such listing is
then permitted under the rules of such exchange, and to provide a transfer
agent, CUSIP number and registrar for such Registrable Securities covered by
such Registration Statement no later than the effective date of such
Registration Statement;

                           (i) enter into agreements (including underwriting
agreements) and take all other appropriate actions in order to expedite or
facilitate the disposition of such Registrable Securities as is customarily made
or done by issuers of comparable standing in connection with comparable
offerings and in such connection (to the extent so customary):

                                       11
<PAGE>

                                    (i) make such representations and warranties
to the Holders of such Registrable Securities and the underwriters, if any, and
agree to such indemnification and contribution agreements, in form, substance
and scope as are customarily made by issuers to underwriters in comparable
underwritten offerings;

                                    (ii) obtain opinions of counsel to the
Company (which counsel and opinions (in form, scope and substance) shall be
reasonably satisfactory to the underwriters, if any, and the Holders of the
Registrable Securities being sold) addressed to each Holder and the
underwriters, if any, covering the matters customarily covered in opinions
requested in comparable underwritten offerings and such other matters as may be
reasonably requested by such Holders and underwriters;

                                    (iii) obtain comfort letters and updates
thereof from the Company's independent accountants addressed to the selling
Holders of Registrable Securities and the underwriters, if any, such letters to
be in customary form and covering matters of the type customarily covered in
"cold comfort" letters in connection with comparable underwritten offerings;

                                    (iv) if requested, provide the
indemnification in accordance with the provisions and procedures of Section 9
hereof to all parties to be indemnified pursuant to said Section; and

                                    (v) deliver such documents and certificates
as may be reasonably requested by the Holders of a majority of the Registrable
Securities being sold and the underwriters, if any, to evidence compliance with
clause (f) above and with any customary conditions contained in the underwriting
agreement or other agreement entered into by the Company. The matters set forth
in this Section 7(i) shall be effected at each closing under any underwriting or
similar agreement as and to the extent required thereunder.

                           (j) cooperate with the Holders of Registrable
Securities covered by such Registration Statement and the underwriter or
underwriters, if any, to facilitate the timely preparation and delivery of
certificates (not bearing any restrictive legends) representing the securities
to be sold under such Registration Statement, and enable such securities to be
in such denominations and registered in such names as the underwriter or
underwriters, if any, or such Holders may request, or take other appropriate
action if the Registrable Securities are to be uncertificated;

                           (k) if requested by the underwriter or underwriters
or a Holder of Registrable Securities being sold in connection with an
underwritten offering, promptly incorporate in a Prospectus supplement or
post-effective amendment such information as the underwriters and the Holders of
the Registrable Securities being sold agree should be included therein relating
to the plan of distribution with respect to such Registrable Securities,
including, without limitation, information with respect to the amount of
Registrable Securities being sold to such underwriters, the purchase price being
paid therefor by such underwriters and with respect to any other terms of the
underwritten offering of the Registrable Securities to be sold in such offering
and make all required filings of such Prospectus supplement or post-effective

                                       12
<PAGE>

amendment promptly upon being notified of the matters to be incorporated in such
Prospectus supplement or post-effective amendment;

                           (l) participate, and have senior management available
to participate, in any "roadshow" marketing efforts reasonably requested by the
Holders or any underwriters; and

                           (m) make available for inspection by any Holder of
Registrable Securities included in such Registration Statement, any underwriter
participating in any disposition pursuant to such Registration Statement, and
any attorney, accountant or other agent retained by any such Holder or
underwriter in connection with such disposition, such financial and other
records and other information, pertinent corporate documents and properties of
any of the Company and its subsidiaries and affiliates, as shall be reasonably
necessary to enable them to exercise their due diligence responsibility.

                  The Company may require each Holder of Registrable Securities
as to which any registration is being effected to furnish the Company with such
information regarding such Holder and pertinent to the disclosure requirements
relating to the registration and the distribution of such securities as the
Company may from time to time reasonably request.

                  Each Holder of Registrable Securities agrees that, upon
receipt of any notice (the "Suspension Notice") from the Company of the
happening of any event of the kind described in Section 7(e), such Holder will
forthwith discontinue disposition of Registrable Securities pursuant to the
Prospectus or Registration Statement covering such Registrable Securities until
such Holder's receipt of the copies of the supplemented or amended Prospectus
contemplated by Section 7(e), and, if so directed by the Company, such Holder
will use its best efforts to deliver to the Company (at the Company's expense)
all copies, other than permanent file copies then in such Holder's possession,
of the Prospectus covering such Registrable Securities current at the time of
receipt of such notice. In the event the Company shall give any such notice, the
period of time during which the Registration Statement is required to be
Continuously Effective pursuant to Section 3 hereof shall be extended by the
number of days during the period (the "Suspension Period") from the date of the
giving of such Suspension Notice and through the date when the Holders of
Registrable Securities covered by such Registration Statement shall have
received the copies of the supplemented or amended Prospectus contemplated by
Section 7(e).

                                  ARTICLE VIII

                              REGISTRATION EXPENSES

                  The Company will pay all Registration Expenses in connection
with all registrations of Registrable Securities, and the Holders shall pay all
underwriting discounts and commissions and transfer taxes, if any, relating to
the sale or disposition of such Holders' Registrable Securities pursuant to a
Registration Statement.

                                       13
<PAGE>

                                   ARTICLE IX

                          INDEMNIFICATION; CONTRIBUTION

         Section 9.1 Indemnification by the Company. The Company agrees to
indemnify each Holder of Registrable Securities, its officers and directors and
each Person who controls such Holder (within the meaning of the Securities Act),
and any agent and investment or financial adviser thereof against all losses,
claims, damages, liabilities and expenses (including reasonable attorneys' fees
and expenses of investigation) incurred by such party pursuant to any actual or
threatened action, suit, proceeding or investigation arising out of or based
upon (i) any untrue or alleged untrue statement of material fact contained in a
Registration Statement, any Prospectus or preliminary Prospectus, or any
amendment or supplement to any of the foregoing or (ii) any omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein (in the case of a Prospectus or a
preliminary Prospectus, in light of the circumstances under which they were
made) not misleading, except in each case insofar as the same arise out of or
are based upon any such untrue statement or omission made in reliance on and in
conformity with information furnished in writing to the Company by any party
indemnified under this Section 9.1 or its counsel expressly for use therein. In
connection with an Underwritten Offering, the Company will indemnify the
underwriters thereof, their officers and directors and each Person who controls
such underwriters (within the meaning of the Securities Act) to the same extent
as provided above with respect to the indemnification of the Holders of
Registrable Securities (provided that as to each underwriter the exception to
such indemnification obligation shall instead be for information with respect to
such underwriter furnished in writing by such underwriter or its counsel).
Notwithstanding the foregoing provisions of this Section 9.1, in the case of an
offering that is not an Underwritten Offering, the Company will not be liable to
any Holder of Registrable Securities under the indemnity agreement in this
Section 9.1 for any such loss, claim, damage, liability (or action or proceeding
in respect thereof) or expense that arises out of such Holder's failure to send
or give a copy of the final Prospectus (as it may then be amended or
supplemented) to the Person asserting an untrue statement or alleged untrue
statement or omission or alleged omission at or prior to the written
confirmation of the sale of the Registrable Securities to such Person if such
statement or omission was corrected in such final Prospectus (as it may then be
amended or supplemented) and the Company has previously furnished copies thereof
in accordance with this Agreement.

         Section 9.2 Indemnification by Holders of Registrable Securities. In
connection with a Registration Statement, each Holder shall furnish to the
Company in writing such information, including with respect to the name, address
and the amount of Registrable Securities held by such Holder, as the Company
reasonably requests for use in such Registration Statement or the related
Prospectus and agrees to indemnify and hold harmless (in the same manner and to
the same extent as set forth in Section 9.1 the Company, all other prospective
Holders or any underwriter, as the case may be, and any of their respective
affiliates, directors, officers and controlling Persons (within the meaning of
the Securities Act) against any losses, claims, damages, liabilities and
expenses resulting from any untrue or alleged untrue statement of a material
fact or any omission or alleged omission of a material fact required to be
stated in such Registration Statement or Prospectus or any amendment or
supplement to either of them or necessary to make the statements therein (in the
case of a Prospectus, in the light of the

                                       14
<PAGE>

circumstances then existing) not misleading, but only to the extent that any
such untrue statement or omission is made in reliance on and in conformity with
information with respect to such Holder furnished in writing to the Company by
such Holder or its counsel specifically for inclusion therein.

         Section 9.3 Conduct of Indemnification Proceedings. Any Person entitled
to indemnification hereunder agrees to give prompt written notice to the
indemnifying party after the receipt by such indemnified party of any written
notice of the commencement of any action, suit, proceeding or investigation or
threat thereof made in writing for which such indemnified party may claim
indemnification or contribution pursuant to this Agreement (provided that
failure to give such notification shall not affect the obligations of the
indemnifying person pursuant to this Section 9 except to the extent the
indemnifying party shall have been actually prejudiced as a result of such
failure). In case any such action shall be brought against any indemnified party
and it shall notify the indemnifying party of the commencement thereof, the
indemnifying party shall be entitled to participate therein and, to the extent
that it shall wish, jointly with any other indemnifying party similarly
notified, to assume the defense thereof, with counsel reasonably satisfactory to
the indemnified parties and after notice from the indemnifying party to such
indemnified party of its election so to assume the defense thereof, the
indemnifying party shall not be liable to such indemnified party under these
indemnification provisions for any legal expenses of other counsel or any other
expenses, in each case subsequently incurred by such indemnified party, in
connection with the defense thereof other than reasonable costs of
investigation, except as provided in the following sentence. Any such
indemnified party shall have the right to employ separate counsel in any such
action, claim or proceeding and to participate in the defense thereof, but the
fees and expenses of such counsel shall be the expenses of such indemnified
party unless (i) the indemnifying party has agreed to pay such fees and expenses
or (ii) the indemnifying party shall have failed to promptly assume the defense
of such action, claim or proceeding or (iii) the named parties to any such
action, claim or proceeding (including any impleaded parties) include both such
indemnified party and the indemnifying party, and such indemnified party shall
have been advised by counsel that there may be one or more legal defenses
available to it which are different from or in addition to those available to
the indemnifying party and that the assertion of such defenses could, in the
good faith judgment of the indemnified party, create a conflict of interest such
that counsel employed by the indemnifying party could not faithfully represent
the indemnified party (in case of clauses (ii) and (iii) , if such indemnified
party notifies the indemnifying party in writing that it elects to employ
separate counsel at the expense of the indemnifying party (which counsel shall
be reasonably satisfactory to the indemnifying party), the indemnifying party
shall not have the right to assume the defense of such action, claim or
proceeding on behalf of such indemnified party; it being understood, however,
that the indemnifying party shall not, in connection with any one such action,
claim or proceeding or separate but substantially similar or related actions,
claims or proceedings in the same jurisdiction arising out of the same general
allegations or circumstances, be liable for the reasonable fees and expenses of
more than one separate firm of attorneys (together with appropriate local
counsel) at any time for all such indemnified parties, unless in the good faith
judgment of such indemnified party a conflict of interest may exist between such
indemnified party and any other of such indemnified parties with respect to such
action, claim or proceeding, in which event the indemnifying party shall be
obligated to pay the fees and expenses

                                       15
<PAGE>

of such additional counsel or counsels). The indemnifying party will not be
subject to any liability for any settlement made without its consent (which
consent will not be unreasonably withheld).

         Section 9.4 Contribution. To the extent the indemnification from the
indemnifying party provided for in this Section 9 is unavailable to an
indemnified party hereunder in respect of any losses, claims, damages,
liabilities or expenses referred to therein, then the indemnifying party, in
lieu of indemnifying such indemnified party, shall contribute to the amount paid
or payable by such indemnified party as a result of such losses, claims,
damages, liabilities and expenses in such proportion as is appropriate to
reflect the relative fault of the indemnifying party and indemnified party in
connection with the actions which resulted in such losses, claims, damages,
liabilities and expenses, as well as any other relevant equitable
considerations. The relative fault of such indemnifying party and indemnified
party shall be determined by reference to, among other things, whether any
action in question, including any untrue or alleged untrue statement of a
material fact or omission or alleged omission to state a material fact, has been
made by, or relates to information supplied by, such indemnifying party or
indemnified party, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such action. The amount paid
or payable by a party as a result of the losses, claims, damages, liabilities
and expenses referred to above shall be deemed to include, subject to the
limitations set forth in Section 9.3, any legal and other fees and expenses
reasonably incurred by such indemnified party in connection with any
investigation or proceeding. The parties hereto agree that it would not be just
and equitable if contribution pursuant to this Section 9.4 were determined by
pro rata allocation or by any other method of allocation which does not take
account of the equitable considerations referred to in the immediately preceding
paragraph. Notwithstanding the provisions of this Section 9.4, no underwriter
shall be required to contribute any amount in excess of the amount by which the
total price at which the Registrable Securities underwritten by it and
distributed to the public were offered to the public exceeds the amount of any
damages which such underwriter has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission, and no
Holder of Registrable Securities shall be required to contribute any amount in
excess of the amount by which the total price at which the Registrable
Securities of such Holder were offered to the public (net of all underwriting
discounts and commissions) exceeds the amount of any damages which such Holder
has otherwise been required to pay by reason of such untrue statement or
omission. No Person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any Person who was not guilty of such fraudulent misrepresentation. To the
extent indemnification is available under this Section 9, the indemnifying
parties shall indemnify each indemnified party to the full extent provided in
Section 91 or 9.2, as the case may be, without regard to the relative fault of
said indemnifying parties or indemnified party or any other equitable
consideration provided for in this Section 9.4.

         Section 9.5 The provisions of this Section 9 shall be applicable in
respect of each registration pursuant to this Agreement, shall be in addition to
any liability which any party may have to any other party and shall survive any
termination of this Agreement.

                                       16
<PAGE>

                                    ARTICLE X

                                    RULE 144

         For a period of two years following the Closing Date or, if at the end
of such two year period, a Holder is an affiliate of the Company, until such
time as no Holder is an affiliate of the Company, the Company covenants that it
will file the reports required to be filed by it under the Securities Act and
the Exchange Act (or, if the Company is not required to file such reports, it
will, upon the request of any Holder of Registrable Securities, make publicly
available other information so long as necessary to satisfy the requirements of
Rule 144 under the Securities Act relating to the availability of public
information), all to the extent required from time to time to enable such Holder
to sell Registrable Securities without registration under the Securities Act
within the limitation of the exemptions provided by (a) Rule 144 under the
Securities Act, as such Rule may be amended from time to time, or (b) any
similar rule or regulation hereafter adopted by the SEC. Upon the request of any
Holder of Registrable Securities, the Company will deliver to such Holder a
written statement as to whether it has complied with such requirements.

                                   ARTICLE XI

                                  MISCELLANEOUS

         Section 11.1 No Inconsistent Agreements. The Company is not a party to
any agreement and will not hereafter enter into any agreement with respect to
its securities which is inconsistent with or which otherwise materially limits,
restricts interferes with the rights granted to the Holders hereunder.

         Section 11.2 Remedies. No failure or delay on the part of either party
hereto in the exercise of any right hereunder shall impair such right or be
construed to be a waiver of, or acquiescence in, any breach of any
representation, warranty or agreement herein, nor shall any single or partial
exercise of any such right preclude other or further exercise thereof or of any
other right. All rights and remedies existing under this Agreement are
cumulative to, and not exclusive of, any rights or remedies otherwise available.
Each Holder of Registrable Securities in addition to being entitled to exercise
all rights granted by law, including recovery of damages, will be entitled to
specific performance of its rights under this Agreement.

         Section 11.3 Termination. The right of any Holder to request
registration or inclusion in any registration pursuant to this Agreement shall
terminate on such date as all shares of Registrable Securities held or entitled
to be held upon conversion by such Holder (and any affiliates that is a Holder)
is less than one percent (1%) of the total outstanding shares of Common Stock of
the Company as shown by the then most recent Form 10-Q of the Company filed with
the SEC or the Holder meets the requirements of Rule 144(k) of the Securities
Act of 1933, as amended.

         Section 11.4 Amendment. No change or amendment will be made to this
Agreement except by an instrument in writing signed on behalf of the Company and
Holders owning a majority of the Registrable Securities at the time of such
amendment.

                                       17
<PAGE>

         Section 11.5 Entire Agreement. This Agreement constitutes the entire
agreement between the parties with respect to the subject matter hereof and
shall supersede all prior written and oral and all contemporaneous oral
agreements and understandings with respect to the subject matter hereof.

         Section 11.6 Notices. Notices, offers, requests or other communications
required or permitted to be given by either party pursuant to the terms of this
Agreement shall be given in writing to the respective parties to the following
addresses:

                  if to the Holders:

                                Schlumberger Technology Corporation
                                5999 San Felipe, Suite 1600
                                Houston, Texas  77054
                                Attention:        Richard Hoffman
                                Telephone:        (713) 513-3723
                                Facsimile:        (713) 513-2030

                  with a copy, which shall not constitute notice, to:

                                Gray Cary Ware & Freidenrich LLP
                                1221 S. MoPac Expressway, Suite 400
                                Austin, Texas  787-6875
                                Attention:        Brian P. Fenske
                                Telephone:        (512) 457-7145
                                Facsimile:        (512) 457-7001

                  if to the Company:

                                Grant Prideco, Inc.
                                1330 Post Oak Blvd., Suite 3700
                                Houston, Texas  77056
                                Attention:        General Counsel
                                Telephone:        (832) 681-8000
                                Facsimile:        (832) 681-8699

                  with a copy, which shall not constitute notice, to:

                                Fulbright & Jaworski L.L.P.
                                1301 McKinney, Suite 5100
                                Houston, Texas  77010-3095
                                Attention:        Charles H. Still
                                Telephone:        (713) 651-5151
                                Facsimile:        (713) 651-5246

                                       18
<PAGE>

or to such other address as the party to whom notice is given may have
previously furnished to the other in writing as provided herein. Any notice
involving non-performance, termination, or renewal shall be sent by hand
delivery, recognized overnight courier or, within the United States, may also be
sent via certified mail, return receipt requested. All other notices may also be
sent by fax, confirmed by first class mail. All notices shall be deemed to have
been given and received on the earlier of actual delivery or three days from the
date of postmark.

         Section 11.7 Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors of each of the parties and each
transferee of Registrable Securities who is an affiliate of a Holder or, if the
Shelf Registration Statement is not Continuously Effective, any transferee of
Registrable Securities who is designated to come within the term "Holder" by the
transferor.

         Section 11.8 Authority. Each of the parties hereto represents to the
other that (a) it has the corporate or other requisite power and authority to
execute, deliver and perform this Agreement, (b) the execution, delivery and
performance of this Agreement by it have been duly authorized by all necessary
corporate or other actions, (c) it has duly and validly executed and delivered
this Agreement, and (d) this Agreement is a legal, valid and binding obligation,
enforceable against it in accordance with its terms subject to applicable
bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting creditors' rights generally and general equity principles.

         Section 11.9 Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed to be an original but all of which
shall constitute one and the same agreement.

         Section 11.10 Descriptive Headings. The headings contained in this
Agreement and in the table of contents to this Agreement are for reference
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement. When a reference is made in this Agreement to an Article or a
Section, such reference shall be to an Article or Section of, or an Exhibit or
Schedule to, this Agreement unless otherwise indicated.

         Section 11.11 Governing Law. This Agreement shall be construed in
accordance with and all disputes hereunder shall be governed by the laws of the
State of Texas, excluding its conflict of law rules.

         Section 11.12 No Strict Construction. The language used in this
Agreement has been chosen by all of the parties hereto to express their mutual
input, and no rule of strict construction will be used against any party hereto.

         Section 11.13 Severability. If any term or other provision of this
Agreement is determined by a court, administrative agency or arbitrator to be
invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect so long as the economic or legal substance of
the transactions contemplated hereby is not affected in any manner materially
adverse to either party. Upon such determination that any term or other
provision is invalid,

                                       19
<PAGE>

illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in an acceptable manner to the end that
transactions contemplated hereby are fulfilled to the fullest extent possible.

            [The Remainder of this Page is Intentionally Left Blank.]

                                       20
<PAGE>

                  IN WITNESS WHEREOF, the parties have executed this
Registration Rights Agreement as of the date first written above.

                                 GRANT PRIDECO, INC.

                                 By:
                                    --------------------------------
                                 Name:
                                      ------------------------------
                                 Title:
                                       -----------------------------

                                 SCHLUMBERGER TECHNOLOGY CORPORATION

                                 By:
                                    --------------------------------
                                 Name:
                                      ------------------------------
                                 Title:
                                       -----------------------------

                                       21<PAGE>
                                                                     EXHIBIT 4.2

--------------------------------------------------------------------------------

                           GRANT PRIDECO ESCROW CORP.

                     (TO BE ASSUMED BY GRANT PRIDECO, INC.)

                                    INDENTURE

                                   RELATING TO

                            9% SENIOR NOTES DUE 2009

                          DATED AS OF DECEMBER 4, 2002

                             WELLS FARGO BANK, N.A.

                                     TRUSTEE

                            9% SENIOR NOTES DUE 2009

--------------------------------------------------------------------------------

<PAGE>

                               TABLE OF CONTENTS

<Table>
<Caption>
                                                                                                            PAGE
                                                                                                            ----
<S>                                                                                                          <C>
                                                    ARTICLE 1.

                                    DEFINITIONS AND INCORPORATION BY REFERENCE

Section 1.01.       Definitions...............................................................................1
Section 1.02.       Other Definitions........................................................................20
Section 1.03.       Incorporation by Reference of Trust Indenture Act........................................21
Section 1.04.       Rules of Construction....................................................................21

                                                    ARTICLE 2.

                                                     THE NOTES

Section 2.01.       Form and Dating..........................................................................22
Section 2.02.       Execution and Authentication.............................................................23
Section 2.03.       Registrar and Paying Agent...............................................................24
Section 2.04.       Paying Agent to Hold Money in Trust......................................................24
Section 2.05.       Holder Lists.............................................................................24
Section 2.06.       Transfer and Exchange....................................................................25
Section 2.07.       Replacement Notes........................................................................39
Section 2.08.       Outstanding Notes........................................................................39
Section 2.09.       Treasury Notes...........................................................................40
Section 2.10.       Temporary Notes..........................................................................40
Section 2.11.       Cancellation.............................................................................40
Section 2.12.       Defaulted Interest.......................................................................41
Section 2.13.       CUSIP Numbers............................................................................41

                                                    ARTICLE 3.

                                             REDEMPTION AND PREPAYMENT

Section 3.01.       Notices to Trustee.......................................................................41
Section 3.02.       Selection of Notes to Be Redeemed........................................................42
Section 3.03.       Notice of Redemption.....................................................................42
Section 3.04.       Effect of Notice of Redemption...........................................................43
Section 3.05.       Deposit of Redemption Price..............................................................43
Section 3.06.       Notes Redeemed in Part...................................................................44
Section 3.07.       Optional Redemption......................................................................44
Section 3.08.       Repurchase at the Option of Holders......................................................44
Section 3.09.       Special Mandatory Redemption.............................................................47
</Table>

                                       -i-
<PAGE>

<Table>
<Caption>
                                                                                                            PAGE
                                                                                                            ----
<S>                                                                                                         <C>
                                                    ARTICLE 4.

                                                     COVENANTS

Section 4.01.       Payment of Notes.........................................................................47
Section 4.02.       Maintenance of Office or Agency..........................................................47
Section 4.03.       Reports..................................................................................48
Section 4.04.       Compliance Certificate...................................................................49
Section 4.05.       Taxes....................................................................................50
Section 4.06.       Stay, Extension and Usury Laws...........................................................50
Section 4.07.       Restricted Payments......................................................................50
Section 4.08.       Dividend and Other Payment Restrictions Affecting Subsidiaries...........................54
Section 4.09.       Incurrence of Indebtedness and Issuance of Preferred Stock...............................55
Section 4.10.       Transactions with  Affiliates............................................................58
Section 4.11.       Liens....................................................................................60
Section 4.12.       Additional Subsidiary Guarantees.........................................................60
Section 4.13.       Designation of Restricted and Unrestricted Subsidiaries..................................60
Section 4.14.       Corporate Existence......................................................................61
Section 4.15.       Asset Sales..............................................................................62
Section 4.16.       Offer to Repurchase Upon Change of Control...............................................63
Section 4.17.       Limitations on Line of Business..........................................................65
Section 4.18.       Sale and Leaseback Transactions..........................................................65
Section 4.19.       Payments for Consent.....................................................................66
Section 4.20.       Suspension of Covenants..................................................................66

                                                    ARTICLE 5.

                                                    SUCCESSORS

Section 5.01.       Merger, Consolidation, or Sale of Assets.................................................66
Section 5.02.       Successor Corporation Substituted........................................................68

                                                    ARTICLE 6.

                                               DEFAULTS AND REMEDIES

Section 6.01.       Events of Default........................................................................68
Section 6.02.       Acceleration.............................................................................70
Section 6.03.       Other Remedies...........................................................................71
Section 6.04.       Waiver of Past Defaults..................................................................71
</Table>

                                      -ii-
<PAGE>

<Table>
<Caption>
                                                                                                            PAGE
                                                                                                            ----
<S>                                                                                                         <C>
Section 6.05.       Control by Majority......................................................................71
Section 6.06.       Limitation on Suits......................................................................72
Section 6.07.       Rights of Holders of Notes to Receive Payment............................................72
Section 6.08.       Collection Suit by Trustee...............................................................72
Section 6.09.       Trustee May File Proofs of Claim.........................................................73
Section 6.10.       Priorities...............................................................................73
Section 6.11.       Undertaking for Costs....................................................................74
Section 6.12.       Restoration of Rights and Remedies.......................................................74
Section 6.13.       Rights and Remedies Cumulative...........................................................74
Section 6.14.       Delay or Omission Not Waiver.............................................................75

                                                    ARTICLE 7.

                                                      TRUSTEE

Section 7.01.       Duties of Trustee........................................................................75
Section 7.02.       Rights of Trustee........................................................................76
Section 7.03.       Individual Rights of Trustee.............................................................77
Section 7.04.       Trustee's Disclaimer.....................................................................77
Section 7.05.       Notice of Defaults.......................................................................78
Section 7.06.       Reports by Trustee to Holders of the Notes...............................................78
Section 7.07.       Compensation and Indemnity...............................................................78
Section 7.08.       Replacement of Trustee...................................................................79
Section 7.09.       Successor Trustee by Merger, etc.........................................................80
Section 7.10.       Eligibility; Disqualification............................................................81
Section 7.11.       Preferential Collection of Claims Against Company........................................81

                                                    ARTICLE 8.

                                                  NOTE GUARANTEES

Section 8.01.       Subsidiary Guarantees....................................................................81
Section 8.02.       Additional Guarantees....................................................................83
Section 8.03.       Limitation on Guarantor Liability........................................................84
Section 8.04.       Merger and Consolidation of Guarantors...................................................84
Section 8.05.       Release..................................................................................85

                                                    ARTICLE 9.

                                     LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 9.01.       Option to Effect Legal Defeasance or Covenant Defeasance.................................85
</Table>

                                      -iii-
<PAGE>

<Table>
<Caption>
                                                                                                            PAGE
                                                                                                            ----
<S>                                                                                                         <C>
Section 9.02.       Legal Defeasance and Discharge...........................................................86
Section 9.03.       Covenant Defeasance......................................................................86
Section 9.04.       Conditions to Legal or Covenant Defeasance...............................................87
Section 9.05.       Deposited Money and U.S. Government Securities to Be Held in Trust; Other
                        Miscellaneous Provisions.............................................................89
Section 9.06.       Repayment to the Company.................................................................89
Section 9.07.       Reinstatement............................................................................90

                                                    ARTICLE 10.

                                         AMENDMENT, SUPPLEMENT AND WAIVER

Section 10.01.      Without Consent of Holders of Notes......................................................90
Section 10.02.      With Consent of Holders of Notes.........................................................91
Section 10.03.      Compliance with Trust Indenture Act......................................................92
Section 10.04.      Revocation and Effect of Consents........................................................93
Section 10.05.      Notation on or Exchange of Notes.........................................................93
Section 10.06.      Trustee to Sign Amendments, etc..........................................................93

                                                    ARTICLE 11.

                                            SATISFACTION AND DISCHARGE

Section 11.01.      Satisfaction and Discharge...............................................................93
Section 11.02.      Application of Trust.....................................................................94

                                                    ARTICLE 12.

                                                   MISCELLANEOUS

Section 12.01.      Trust Indenture Act Controls.............................................................95
Section 12.02.      Notices..................................................................................95
Section 12.03.      Communication by Holders of Notes with Other Holders of Notes............................96
Section 12.04.      Certificate and Opinion as to Conditions Precedent.......................................96
Section 12.05.      Statements Required in Certificate or Opinion............................................97
Section 12.06.      Rules by Trustee and Agents..............................................................97
Section 12.07.      No Personal Liability of Directors, Officers, Employees and Stockholders.................97
Section 12.08.      Governing Law............................................................................98
Section 12.09.      No Adverse Interpretation of Other Agreements............................................98
Section 12.10.      Successors...............................................................................98
</Table>

                                      -iv-
<PAGE>

<Table>
<Caption>
                                                                                                            PAGE
                                                                                                            ----
<S>                                                                                                         <C>
Section 12.11.      Severability.............................................................................98
Section 12.12.      Counterpart Originals....................................................................98
Section 12.13.      Table of Contents, Headings, etc.........................................................98

EXHIBITS

Exhibit A:        FORM OF NOTE
Exhibit B:        FORM OF CERTIFICATE OF TRANSFER
Exhibit C:        FORM OF CERTIFICATE OF EXCHANGE
Exhibit D:        FORM OF CERTIFICATE FROM ACQUIRING INSTITUTIONAL
                    ACCREDITED INVESTOR
Exhibit E:        FORM OF GUARANTEE
</Table>

                                       -v-
<PAGE>

                             CROSS-REFERENCE TABLE*

                               TRUST INDENTURE ACT

<Table>
<Caption>
TIA SECTION                                                                      INDENTURE SECTION
<S>                                                                              <C>
310(a)(1)..................................................................       7.10
   (a)(2)..................................................................       7.10
   (a)(3)..................................................................       N.A.
   (a)(4)..................................................................       N.A.
   (a)(5)..................................................................       7.10
   (b).....................................................................       7.08;7.10
   (c).....................................................................       N.A.
311(a).....................................................................       7.11
   (b).....................................................................       7.11
   (c).....................................................................       N.A.
312(a).....................................................................       2.05
   (b).....................................................................       12.03
   (c).....................................................................       12.03
313(a).....................................................................       7.06
   (b)(2)..................................................................       7.06
   (c).....................................................................       7.06;12.02
   (d).....................................................................       7.06
314(a).....................................................................       4.03; 4.04(a); 12.02
   (c)(1)..................................................................       12.04
   (c)(2)..................................................................       12.04
   (c)(3)..................................................................       N.A.
   (e).....................................................................       12.05
   (f).....................................................................       N.A.
315(a).....................................................................       7.01
   (b).....................................................................       7.05;12.02
   (c).....................................................................       7.01
   (d).....................................................................       7.01
   (e).....................................................................       6.11
316(a)(last sentence)......................................................       2.09
   (a)(1)(A)...............................................................       6.05
   (a)(1)(B)...............................................................       6.04
   (a)(2)..................................................................       N.A.
   (b).....................................................................       6.07
317(a)(1)..................................................................       6.08
   (a)(2)..................................................................       6.09
   (b).....................................................................       2.05
</Table>

                                      -vi-
<PAGE>

<Table>
<Caption>
TIA SECTION                                                                      INDENTURE SECTION
<S>                                                                              <C>
318(a).....................................................................       12.01
   (b).....................................................................       N.A.
   (c).....................................................................       12.01
</Table>

N.A. means not applicable.
*This Cross-Reference Table is not part of this Indenture.

                                      -vii-
<PAGE>

                  INDENTURE, dated as of December 4, 2002 (the "Indenture"),
among Grant Prideco Escrow Corp., a Delaware corporation (the "Company"), the
Subsidiary Guarantors, if any, identified herein and Wells Fargo Bank, N.A., a
national banking corporation, as trustee (the "Trustee").

                  The Company, the Subsidiary Guarantors, if any, and the
Trustee agree as follows for the benefit of each other and for the equal and
ratable benefit of the holders (the "Holders") of the 9% Senior Notes due 2009
(the "Initial Notes") and the 9% Senior Notes due 2009 to be used in exchange
for such Initial Notes in the Exchange Offer (the "Exchange Notes" and, together
with the Initial Notes and any Additional Notes that may be issued in the future
in accordance with Article 2, the "Notes"):

                                   ARTICLE 1.

                   DEFINITIONS AND INCORPORATION BY REFERENCE

Section 1.01. Definitions.

                  "144A Global Note" means a global note in substantially the
form of Exhibit A hereto bearing the Global Note Legend and the Private
Placement Legend and deposited with or on behalf of, and registered in the name
of, the Depositary or its nominee that shall be issued in a denomination equal
to the outstanding principal amount of the Notes sold in reliance on Rule 144A.

                  "Acquired Debt" means, with respect to any specified person,
(1) Indebtedness of any other person existing at the time such other person is
merged with or into or became a Restricted Subsidiary of such specified person,
whether or not such Indebtedness is incurred in connection with, or in
contemplation of, such other person merging with or into, or becoming a
Restricted Subsidiary of, such specified person; and (2) Indebtedness secured by
a Lien encumbering any asset acquired by such specified person.

                  "Acquisition" means the consummation of the acquisition of
substantially all of the assets and business operations of Reed-Hycalog by Grant
Prideco, Inc.

                  "Acquisition Agreement" means the purchase agreement by and
between Schlumberger Technology Corporation, a Texas corporation, and Grant
Prideco, Inc., a Delaware corporation, dated as of October 25, 2002.

                  "Acquisition Closing Date" means the consummation of (i) Grant
Prideco, Inc.'s acquisition of substantially all of the assets and operations
that comprise the drill bits business of, and are wholly-owned by Schlumberger
Technology Corporation pursuant to the Acquisition Agreement (the "Acquisition")
and (ii) the Grant Prideco Assumption.

<PAGE>

                  "Additional Notes" means Notes issued pursuant to Article 2
and in compliance with Section 4.09 after the Issue Date.

                  "Affiliate" of any specified person means any other person
directly or indirectly controlling or controlled by or under direct or indirect
common control with such specified person. For purposes of this definition,
"control," as used with respect to any person, means the possession, directly or
indirectly, of the power to direct or cause the direction of the management or
policies of such person, whether through the ownership of voting securities, by
agreement or otherwise; provided that beneficial ownership of 10% or more of the
Voting Stock of a person will be deemed to be controlling. For purposes of this
definition, the terms "controlling," "controlled by" and "under common control
with" have correlative meanings.

                  "Applicable Procedures" means, with respect to any transfer or
exchange of or for any beneficial interests in any Global Note, the rules and
the procedures of the Depositary that apply to such transfer or exchange.

                  "Asset Sale" means (1) the sale, lease, conveyance or other
disposition of any assets or rights, other than sales of inventory or equipment
in the ordinary course of business consistent with past practices; provided that
the sale, conveyance or other disposition of all or substantially all of the
Company's assets and its Restricted Subsidiaries taken as a whole will be
governed by Section 4.16 and/or Section 5.01 and not by Section 4.15; and (2)
the issuance of Equity Interests in any of the Restricted Subsidiaries or the
sale of Equity Interests in any of the Restricted Subsidiaries.

                  Notwithstanding the preceding, the following items will not be
deemed to be Asset Sales (1) any single transaction or series of related
transactions that involves assets having a fair market value of less than $1.0
million; (2) a transfer of assets between or among the Company and its
Restricted Subsidiaries; (3) an issuance of Equity Interests by a Restricted
Subsidiary to the Company or to another Restricted Subsidiary; and (4) a
Restricted Payment or Permitted Investment that is permitted by Section 4.07.

                  "Attributable Debt" in respect of a sale and leaseback
transaction means, at the time of determination, the present value of the
obligation of the lessee for net rental payments during the remaining term of
the lease included in such sale and leaseback transaction including any period
for which such lease has been extended or may, at the option of the lessor, be
extended. Such present value shall be calculated using a discount rate equal to
the rate of interest implicit in such transaction, determined in accordance with
GAAP.

                  "Bankruptcy Law" means Title 11, U.S. Code or any similar
federal or state law for the relief of debtors.

                  "Beneficial Owner" has the meaning assigned to such term in
Rule 13d-3 and Rule 13d-5 under the Exchange Act, except that in calculating the
beneficial ownership of any

                                      -2-
<PAGE>

particular "person" (as that term is used in Section 13(d)(3) of the Exchange
Act), such "person" will be deemed to have beneficial ownership of all
securities that such "person" has the right to acquire by conversion or exercise
of other securities, whether such right is currently exercisable or is
exercisable only upon the occurrence of a subsequent condition. The terms
"Beneficially Owns" and "Beneficially Owned" have a corresponding meaning.

                  "Board of Directors" means (1) with respect to a corporation,
the board of directors or a duly authorized committee of the board of directors
of the corporation; (2) with respect to a partnership, the board of directors or
a duly authorized committee of the board of directors of the general partner of
the partnership; and (3) with respect to any other person, the board or
committee of such person serving a similar function.

                  "Board Resolution" means, with respect to any entity, a copy
of a resolution certified by the Secretary or Assistant Secretary of that entity
to have been duly adopted by the Board of Directors of that entity and to be in
full force and effect on the date of certification, and delivered to the
Trustee.

                  "Broker Dealer" has the meaning set forth in the Registration
Rights Agreement.

                  "Capital Lease Obligation" means, at the time any
determination is to be made, the amount of the liability in respect of a capital
lease that would at that time be required to be capitalized on a balance sheet
in accordance with GAAP.

                  "Capital Stock" means (1) in the case of a corporation,
corporate stock; (2) in the case of an association or business entity, any and
all shares, interests, participations, rights or other equivalents (however
designated) of corporate stock; (3) in the case of a partnership or limited
liability company, partnership or membership interests (whether general or
limited); and (4) any other interest or participation that confers on a person
the right to receive a share of the profits and losses of, or distributions of
assets of, the issuing person.

                  "Cash Equivalents" means (1) United States dollars; (2)
securities issued or directly and fully guaranteed or insured by the United
States government or any agency or instrumentality of the United States
government (provided that the full faith and credit of the United States is
pledged in support of those securities) having maturities of not more than six
months from the date of acquisition; (3) certificates of deposit and eurodollar
time deposits with maturities of six months or less from the date of
acquisition, bankers' acceptances with maturities not exceeding six months and
overnight bank deposits, in each case, with any lender party to a Credit
Facility or with any domestic commercial bank having capital and surplus in
excess of $500 million and a Thomson Bank Watch Rating of "B" or better; (4)
repurchase obligations with a term of not more than seven days for underlying
securities of the types described in clauses (2) and (3) above entered into with
any financial institution meeting the qualifications specified in clause (3)
above; (5) commercial paper having the

                                      -3-
<PAGE>

highest rating obtainable from Moody's or S&P and in each case maturing within
six months after the date of acquisition; and (6) money market funds at least
95% of the assets of which constitute Cash Equivalents of the kinds described in
clauses (1) through (5) of this definition, including any such funds of or to
which the Trustee or any Affiliate of the Trustee is the sponsor, an advisor, a
trustee or a manager.

                  "Change of Control" means the occurrence of any of the
following (1) the direct or indirect sale, transfer, conveyance or other
disposition, other than by way of merger or consolidation, in one or a series of
related transactions, of all or substantially all of the properties or assets of
the Company and its Restricted Subsidiaries, taken as a whole, to any "person,"
as that term is used in Section 13(d)(3) of the Exchange Act; (2) the adoption
of a plan relating to the liquidation or dissolution of the Company; (3) the
consummation of any transaction, including, without limitation, any merger or
consolidation, the result of which is that any "person," as defined in clause
(1) above becomes the ultimate Beneficial Owner, directly or indirectly, of more
than 50% of the Company's Voting Stock, measured by voting power rather than
number of shares; (4) the first day on which a majority of the members of the
Company's entire Board of Directors are not Continuing Directors; or (5) the
Company's consolidation or merger with or into, any person, or the consolidation
or merger of any person with or into, the Company, in any such event pursuant to
a transaction in which any of the Company's outstanding Voting Stock or such
other person is converted into or exchanged for cash, securities or other
property, other than any such transaction where the Company's Voting Stock
outstanding immediately prior to such transaction is converted into or exchanged
for Voting Stock (other than Disqualified Stock) of the surviving or transferee
person, or the direct parent company of the surviving or transferee person,
which, immediately after giving effect to such issuance, constitutes a majority
of the outstanding shares of such Voting Stock of such surviving or transferee
person, or the direct parent company of the surviving or transferee person.

                  For the purposes of this definition of "Change of Control,"
any transfer of any equity of an entity that was formed for the purpose of
acquiring the Company's Voting Stock will be deemed to be a transfer of an
Equity Interest in the Company.

                  "Change of Control Triggering Event" means, the occurrence of
a Change of Control, or if the Company is not subject to the Suspended
Covenants, there occurs both a Change of Control and a Rating Decline.

                  "Clearstream" means Clearstream Banking, societe anonyme,
Luxembourg.

                  "Commission" means the Securities and Exchange Commission.

                  "common stock" means, with respect to any person, any and all
shares, interests, participations or other equivalents, however designated,
whether voting or non-voting, of that person's equity, other than preferred
stock of that person, whether now outstanding or

                                      -4-
<PAGE>

issued after the date the Notes are issued, including without limitation, all
series and classes of that equity.

                  "Company" means (i) prior to the Acquisition Closing Date,
Grant Prideco Escrow Corp., and (ii) from and after the Acquisition Closing
Date, Grant Prideco, Inc., until a successor replaces it and thereafter, means
the successor and for purposes of any provision contained herein and required by
the TIA, each obligor of securities issued under this Indenture.

                  "Consolidated Cash Flow" means, with respect to any specified
person for any period, the Consolidated Net Income of such person for such
period, (1) plus an amount equal to any extraordinary loss plus any net loss
realized by such person or any of its Subsidiaries in connection with an Asset
Sale to the extent such losses were deducted in computing such Consolidated Net
Income; (2) plus provision for taxes based on income or profits of such person
and its Restricted Subsidiaries for such period, to the extent that such
provision for taxes was deducted in computing such Consolidated Net Income; (3)
plus consolidated interest expense of such person and its Restricted
Subsidiaries for such period, whether paid or accrued and whether or not
capitalized (including, without limitation, amortization of debt issuance costs
and original issue discount, non-cash interest payments, the interest component
of any deferred payment obligations, the interest component of all payments
associated with Capital Lease Obligations, imputed interest with respect to
Attributable Debt, commissions, discounts and other fees and charges incurred in
respect of letter of credit or bankers' acceptance financings, and net of the
effect of all payments made or received pursuant to Hedging Obligations), to the
extent that any such expense was deducted in computing such Consolidated Net
Income; (4) plus depreciation, amortization (including amortization of goodwill
and other intangibles but excluding amortization of prepaid cash expenses that
were paid in a prior period) and other non-cash expenses (excluding any such
non-cash expense to the extent that it represents an accrual of or reserve for
cash expenses in any future period) of such person and its Restricted
Subsidiaries for such period to the extent that such depreciation, amortization
and other non-cash expenses were deducted in computing such Consolidated Net
Income; and (5) minus non-cash items increasing such Consolidated Net Income for
such period, other than the accrual of revenue in the ordinary course of
business; in each case, on a consolidated basis and determined in accordance
with GAAP.

                  "Consolidated Net Income" means, with respect to any specified
person for any period, the aggregate of the Net Income of such person and its
Restricted Subsidiaries for such period, on a consolidated basis, determined in
accordance with GAAP; provided, however, that, (1) the Net Income (but not loss)
of any person that is not a Restricted Subsidiary or that is accounted for by
the equity method of accounting will be included only to the extent of the
amount of dividends or distributions paid in cash to the specified person or a
Restricted Subsidiary of the person; (2) the Net Income of any Restricted
Subsidiary will be excluded to the extent that the declaration or payment of
dividends or similar distributions by that Restricted Subsidiary of that Net
Income is not at the date of determination permitted without any prior

                                      -5-
<PAGE>

governmental approval (that has not been obtained) or, directly or indirectly,
by operation of the terms of its charter or any agreement, instrument (other
than those permitted under Section 4.08), judgment, decree, order, statute, rule
or governmental regulation applicable to that Restricted Subsidiary or its
stockholders; (3) the Net Income of any person acquired in a pooling of
interests transaction for any period prior to the date of such acquisition will
be excluded; and (4) the cumulative effect of a change in accounting principles
will be excluded.

                  "Continuing Directors" means, as of any date of determination,
any member of the Company's Board of Directors who (1) was a member of such
Board of Directors on the date of this Indenture; or (2) was nominated for
election or elected to such Board of Directors with the approval of a majority
of the Continuing Directors who were members of such Board at the time of such
nomination or election.

                  "Corporate Trust Office of the Trustee" shall be at the
address of the Trustee specified in Section 12.02 hereof or such other address
as to which the Trustee may give notice to the Company.

                  "Credit Facilities" means, one or more debt facilities
(including, without limitation, the New Credit Facility) or commercial paper
facilities, in each case with banks or other institutional lenders providing for
revolving credit loans, term loans, receivables financing (including through the
sale of receivables to such lenders or to special purpose entities formed to
borrow from such lenders against such receivables) or letters of credit, in each
case, as amended, restated, modified, renewed, refunded, replaced or refinanced
in whole or in part from time to time.

                  "Custodian" means the Trustee, as custodian with respect to
the Notes in global form, or any successor thereto.

                  "Deadline Date" means February 28, 2003.

                  "Default" means any event that is, or with the passage of time
or the giving of notice or both would be, an Event of Default.

                  "Definitive Note" means a certificated Note registered in the
name of the Holder thereof and issued in accordance with Section 2.06 hereof, in
substantially the form of Exhibit A hereto except that such Note shall not bear
the Global Note Legend and shall not have the "Schedule of Exchanges of
Interests in the Global Note" attached thereto.

                  "Depositary" means, with respect to the Notes issuable or
issued in whole or in part in global form, the person specified in Section 2.03
hereof as the Depositary with respect to the Notes, and any and all successors
thereto appointed as depositary hereunder and having become such pursuant to the
applicable provision of this Indenture.

                                      -6-
<PAGE>

                  "Disqualified Stock" means any Capital Stock that, by its
terms (or by the terms of any security into which it is convertible, or for
which it is exchangeable, in each case at the option of the holder of the
Capital Stock), or upon the happening of any event (other than upon an optional
redemption by the Company), matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the holder
of the Capital Stock, in whole or in part, on or prior to the date that is 91
days after the date on which the Notes mature. Notwithstanding the preceding
sentence, any Capital Stock that would constitute Disqualified Stock solely
because the holders of the Capital Stock have the right to require the Company
to repurchase such Capital Stock upon the occurrence of a Change of Control or
an Asset Sale will not constitute Disqualified Stock if the terms of such
Capital Stock provide that the Company may not repurchase or redeem any such
Capital Stock pursuant to such provisions unless such repurchase or redemption
complies with Section 4.07.

                  "Domestic Subsidiary" means any one of the Company's
Restricted Subsidiaries that was formed under the laws of the United States or
any state of the United States or the District of Columbia.

                  "DTC" means The Depositary Trust Company.

                  "Equity Interests" means Capital Stock and all warrants,
options or other rights to acquire Capital Stock (but excluding any debt
security that is convertible into, or exchangeable for, Capital Stock).

                  "Equity Offering" means any public or private sale of the
Company's Equity Interests (other than Disqualified Stock).

                  "ERISA" means the Employee Retirement Income Security Act of
1974 and regulations promulgated thereunder.

                  "Escrow Agreement" means the Escrow Agreement dated as of
December 4, 2002 between the Company and Wells Fargo Bank, N.A., as escrow agent
thereunder, as amended from time to time.

                  "Escrowed Property" has the meaning assigned to such term
under the Escrow Agreement.

                  "Euroclear" means Morgan Guaranty Trust Company of New York,
Brussels office, as operator of the Euroclear System.

                  "Exchange Act" means the Securities and Exchange Act of 1934,
as amended.

                  "Exchange Notes" means the Notes to be issued in the Exchange
Offer pursuant to Section 2.06 hereof.

                                      -7-
<PAGE>

                  "Exchange Offer" has the meaning set forth in the Registration
Rights Agreement.

                  "Exchange Offer Registration Statement" has the meaning set
forth in the Registration Rights Agreement.

                  "Existing Indebtedness" means the Indebtedness of the Company
and its Subsidiaries (other than Indebtedness under the New Credit Facility) in
existence on the Issue Date, until such amounts are repaid.

                  "Fixed Charges" means, with respect to any specified person
for any period, the sum, without duplication, of (1) the consolidated interest
expense of such person and its Restricted Subsidiaries for such period, whether
paid or accrued, including, without limitation, amortization of debt issuance
costs and original issue discount, non-cash interest payments, the interest
component of any deferred payment obligations, the interest component of all
payments associated with Capital Lease Obligations, imputed interest with
respect to Attributable Debt, commissions, discounts and other fees and charges
incurred in respect of letter of credit or bankers' acceptance financings, and
net of the effect of all payments made or received pursuant to Hedging
Obligations; plus (2) the consolidated interest of such person and its
Restricted Subsidiaries that was capitalized during such period; plus (3) any
interest expense on Indebtedness of another person that is guaranteed by such
person or one of its Restricted Subsidiaries or secured by a Lien on assets of
such person or one of its Restricted Subsidiaries, whether or not such guarantee
or Lien is called upon; plus (4) the product of (a) all dividends, whether paid
or accrued and whether or not in cash, on any series of preferred stock of such
person or any of its Restricted Subsidiaries, other than dividends on Equity
Interests payable solely in the Company's Equity Interests (other than
Disqualified Stock) or to the Company or one of its Restricted Subsidiaries,
times (b) a fraction, the numerator of which is one and the denominator of which
is one minus the then current combined federal, state and local statutory tax
rate of such person, expressed as a decimal, in each case, on a consolidated
basis and in accordance with GAAP.

                  "Fixed Charge Coverage Ratio" means with respect to any
specified person for any period, the ratio of the Consolidated Cash Flow of such
person and its Restricted Subsidiaries for such period to the Fixed Charges of
such person and its Restricted Subsidiaries for such period. In the event that
the specified person or any of its Restricted Subsidiaries incurs, assumes,
guarantees, repays, repurchases or redeems any Indebtedness (other than ordinary
working capital borrowings) or issues, repurchases or redeems preferred stock
subsequent to the commencement of the period for which the Fixed Charge Coverage
Ratio is being calculated and on or prior to the date on which the event for
which the calculation of the Fixed Charge Coverage Ratio is made (the
"Calculation Date"), then the Fixed Charge Coverage Ratio will be calculated
giving pro forma effect to such incurrence, assumption, guarantee, repayment,
repurchase or redemption of Indebtedness, or such issuance, repurchase or

                                      -8-
<PAGE>

redemption of preferred stock, and the use of the proceeds therefrom as if the
same had occurred at the beginning of the applicable four-quarter reference
period.

                  In addition, for purposes of calculating the Fixed Charge
Coverage Ratio, (1) acquisitions that have been made by the specified person or
any of its Restricted Subsidiaries, including through mergers or consolidations
and including any related financing transactions, during the four-quarter
reference period or subsequent to such reference period and on or prior to the
Calculation Date will be given pro forma effect (calculated in accordance with
Regulation S-X) as if they had occurred on the first day of the four-quarter
reference period and Consolidated Cash Flow for such reference period will be
calculated without giving effect to clause (3) of the proviso set forth in the
definition of Consolidated Net Income; (2) the Consolidated Cash Flow
attributable to discontinued operations, as determined in accordance with GAAP,
and operations or businesses disposed of prior to the Calculation Date, will be
excluded; and (3) the Fixed Charges attributable to discontinued operations, as
determined in accordance with GAAP, and operations or businesses disposed of
prior to the Calculation Date, will be excluded, but only to the extent that the
obligations giving rise to such Fixed Charges will not be obligations of the
specified person or any of its Restricted Subsidiaries following the Calculation
Date.

                  "Foreign Restricted Subsidiary" means any of the Company's
Restricted Subsidiaries that is not a Domestic Subsidiary.

                  "GAAP" means generally accepted accounting principles set
forth in the opinions and pronouncements of the Accounting Principles Board of
the American Institute of Certified Public Accountants and statements and
pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as have been approved by a significant segment
of the accounting profession, which are in effect on the date of this Indenture.

                  "Global Note Legend" means the legend set forth in Section
2.06(g)(ii), which is required to be placed on all Global Notes issued under
this Indenture.

                  "Global Notes" means, individually and collectively, each of
the Restricted Global Notes and the Unrestricted Global Notes in the form of
Exhibit A hereto issued in accordance with Section 2.01, 2.06(b)(iv), 2.06(c) or
2.06(f) hereof.

                  "Government Securities" means direct obligations of, or
obligations fully and unconditionally guaranteed or insured by, the United
States of America or any agency or instrumentality thereof for the payment of
which obligations or guarantee the full faith and credit of the United States is
pledged and which are not callable or redeemable at the issuer's option (unless,
for purposes of "Cash Equivalents" only, the obligations are redeemable or
callable at a price not less than the purchase price paid by the Company or any
of the

                                      -9-
<PAGE>

Company's Restricted Subsidiaries, together with all accrued and unpaid
interest, if any, on such Government Securities).

                  "Grant Prideco Assumption" means the assumption (i) by Grant
Prideco, Inc. of the obligations of Grant Prideco Escrow Corp. under this
Indenture, the Notes and the Escrow Agreement and (ii) by the Guarantors
existing on the Acquisition Closing Date of the indemnification obligations of
Grant Prideco Escrow Corp. under the Purchase Agreement pursuant to the terms of
the Escrow Agreement and this Indenture.

                  "Grant Prideco, Inc." means Grant Prideco, Inc., a Delaware
corporation.

                  "guarantee" means a guarantee other than by endorsement of
negotiable instruments for collection in the ordinary course of business, direct
or indirect, in any manner including, without limitation, by way of a pledge of
assets or through letters of credit or reimbursement agreements in respect
thereof, of all or any part of any Indebtedness.

                  "Guarantors" means each of (1) the Domestic Subsidiaries; and
(2) any other Subsidiary that executes a Subsidiary Guarantee in accordance with
the provisions of this Indenture; and their respective successors and assigns.

                  "Hedging Obligations" means, with respect to any specified
person, the obligations of such person incurred in the normal course of business
and consistent with past practices and not for speculative purposes under (1)
interest rate swap agreements, interest rate cap agreements and interest rate
collar agreements; (2) foreign exchange contracts and currency protection
agreements entered into with one or more financial institutions is designed to
protect the person or entity entering into the agreement against fluctuations in
interest rates or currency exchange rates with respect to Indebtedness incurred
and not for purposes of speculation; (3) any commodity futures contract,
commodity option or other similar agreement or arrangement designed to protect
against fluctuations in the price of commodities used by that entity at the
time; and (4) other agreements or arrangements designed to protect such person
against fluctuations in interest rates or currency exchange rates.

                  "incur" means create, incur, issue, assume, guarantee or
otherwise become liable, directly or indirectly, contingently or otherwise, for
any Indebtedness. The term "incurrence" when used as a noun shall have a
correlative meaning. The accretion of principal of a non-interest bearing or
other discount security shall not be deemed the incurrence of Indebtedness.

                  "Indebtedness" means, with respect to any specified person,
any indebtedness of such person, whether or not contingent (1) in respect of
borrowed money; (2) evidenced by bonds, notes, debentures or similar instruments
or letters of credit (or reimbursement agreements in respect thereof); (3) in
respect of banker's acceptances; (4) representing Capital Lease Obligations; (5)
representing the balance deferred and unpaid of the purchase price of

                                      -10-
<PAGE>

any property, except any such balance that constitutes an accrued expense or
trade payable; or (6) representing any Hedging Obligations, if and to the extent
any of the preceding items (other than letters of credit and Hedging
Obligations) would appear as a liability upon a balance sheet of the specified
person prepared in accordance with GAAP. In addition, the term "Indebtedness"
includes all Indebtedness of others secured by a Lien on any asset of the
specified person (whether or not such Indebtedness is assumed by the specified
person) and, to the extent not otherwise included, the guarantee by the
specified person of any indebtedness of any other person.

                  The amount of any Indebtedness outstanding as of any date will
be (1) the accreted value of the Indebtedness, in the case of any Indebtedness
issued with original issue discount; and (2) the principal amount of the
Indebtedness, together with any interest on the Indebtedness that is more than
30 days past due, in the case of any other Indebtedness.

                  "Indenture" means this Indenture, as amended or supplemented
from time to time in accordance with Article 10 hereof.

                  "Indirect Participant" means a person who holds a beneficial
interest in a Global Note through a Participant.

                  "Initial Deposit" has the meaning assigned to such term under
the Escrow Agreement.

                  "Initial Notes" means $175.0 million in aggregate principal
amount of Notes issued under this Indenture on the date hereof.

                  "Initial Purchasers" means Deutsche Bank Securities Inc. and
Merrill Lynch, Pierce, Fenner & Smith Incorporated.

                  "Institutional Accredited Investor" means an "accredited
investor" within the meaning of Rule 501(a)(1), (2), (3) or (7) under the
Securities Act.

                  "Investment Grade Rating" means a rating equal to or higher
than Baa3 (or the equivalent) by Moody's or BBB- (or the equivalent) by S&P.

                  "Investments" means, with respect to any person, all direct or
indirect investments by such person in other persons (including Affiliates) in
the forms of loans (including guarantees or other obligations), advances or
capital contributions (excluding commission, travel and similar advances to
officers and employees made in the ordinary course of business), purchases or
other acquisitions for consideration of Indebtedness, Equity Interests or other
securities, together with all items that are or would be classified as
investments on a balance sheet prepared in accordance with GAAP. If the Company
or any of its Restricted Subsidiaries sells or otherwise disposes of any Equity
Interests of any of its direct or indirect Subsidiaries such that, after giving
effect to any such sale or disposition, such person is no longer

                                      -11-
<PAGE>

a Subsidiary of the Company, the Company shall be deemed to have made an
Investment on the date of any such sale or disposition equal to the fair market
value of the Equity Interests of such Restricted Subsidiary not sold or disposed
of in an amount determined as provided in Section 4.07(e). The acquisition by
the Company or any of its Restricted Subsidiaries of a person that holds an
Investment in a third person will be deemed to be an Investment by the Company
or such Restricted Subsidiary in such third person in an amount equal to the
fair market value of the Investment held by the acquired person in such third
person in an amount determined as provided Section 4.07(e).

                  "Issue Date" means December 4, 2002, the date of original
issuance of the Notes.

                  "Letter of Transmittal" means the letter of transmittal to be
prepared by the Company and sent to all Holders of the Notes for use by such
Holders in connection with the Exchange Offer.

                  "Lien" means, with respect to any asset, any mortgage, lien,
pledge, charge, security interest or encumbrance of any kind in respect of such
asset, whether or not filed, recorded or otherwise perfected under applicable
law, including any conditional sale or other title retention agreement, any
lease in the nature thereof, any option or other agreement to sell or give a
security interest in and any filing of or agreement to give any financing
statement under the Uniform Commercial Code (or equivalent statutes) of any
jurisdiction.

                  "Liquidated Damages" means all additional interest then owing
pursuant to the Registration Rights Agreement.

                  "Merger" means the merger of Grant Prideco Escrow Corp. with
and into Grant Prideco, Inc. in connection with the consummation of the
Acquisition.

                  "Moody's" means Moody's Investors Service, Inc. or any
successor to the rating agency business thereof.

                  "Net Income" means, with respect to any specified person, the
net income (loss) of such person, determined in accordance with GAAP and before
any reduction in respect of preferred stock dividends, excluding, however, (1)
any gain (but not loss), together with any related provision for taxes on such
gain (but not loss), realized in connection with: (a) any Asset Sale; or (b) the
disposition of any securities by such person or any of its Restricted
Subsidiaries or the extinguishment of any Indebtedness of such person or any of
its Restricted Subsidiaries; and (2) any extraordinary gain (but not loss),
together with any related provision for taxes on such extraordinary gain (but
not loss).

                  "Net Proceeds" means the aggregate cash proceeds received by
the Company or any of its Restricted Subsidiaries in respect of any Asset Sale
(including, without limitation, any cash received upon the sale or other
disposition of any non-cash consideration received in

                                      -12-
<PAGE>

any Asset Sale), net of the direct costs relating to such Asset Sale, including,
without limitation, legal, accounting and investment banking fees, and sales or
brokerage commissions, and any relocation expenses incurred as a result of the
Asset Sale, taxes paid or payable as a result of the Asset Sale, in each case,
after taking into account any available tax credits or deductions and any tax
sharing arrangements, and amounts required to be applied to the repayment of
Indebtedness secured by a Lien on the asset or assets that were the subject of
such Asset Sale, and any reserve for adjustment in respect of the sale price of
such asset or assets established in accordance with GAAP.

                  "New Credit Facility" means that certain credit agreement to
be dated on or about the Acquisition Closing Date, by and among Grant Prideco,
Inc. and certain of its affiliates and a syndicate of United States and Canadian
banks, including any related notes, guarantees, collateral documents,
instruments and agreements executed in connection therewith, and in each case as
amended, modified, renewed, refunded, replaced or refinanced from time to time.

                  "Non-Recourse Debt" means Indebtedness (1) as to which neither
the Company nor any of its Restricted Subsidiaries (a) provides credit support
of any kind (including any undertaking, agreement or instrument that would
constitute Indebtedness), (b) is directly or indirectly liable as a guarantor or
otherwise, or (c) constitutes the lender; (2) no default with respect to which
(including any rights that the holders thereof may have to take enforcement
action against an Unrestricted Subsidiary) would permit upon notice, lapse of
time of both any holder of any other Indebtedness (other than the Notes) of the
Company or any of its Restricted Subsidiaries to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its stated maturity; and (3) as to which the lenders have been notified in
writing that they will not have any recourse to the stock or assets of the
Company or any of its Restricted Subsidiaries.

                  "Notes" has the meaning assigned to it in the preamble to this
Indenture.

                  "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.

                  "Offering" means the offering of the Notes by the Company
pursuant to the Company's Offering Memorandum, dated November 25, 2002.

                  "Officer" means, with respect to any person, the Chairman of
the Board, the Chief Executive Officer, the President, the Chief Operating
Officer, the Chief Financial Officer, the Treasurer, and Assistant Treasurer,
the Controller, the Secretary, any Assistant Secretary or any Vice-President of
such person.

                                      -13-
<PAGE>

                  "Officers' Certificate" means a certificate signed on behalf
of the Company by at least two Officers of the Company, one of whom must be the
principal executive officer, the principal financial officer, the treasurer or
the principal accounting officer of the Company, that meets the requirements of,
including, without limitation, Sections 12.04 and 12.05 hereof.

                  "Opinion of Counsel" means an opinion of legal counsel who is
reasonably acceptable to the Trustee, that meets the requirements of, including,
without limitation, Sections 12.04 and 12.05 hereof. The counsel may be an
employee of or counsel to the Company, any Subsidiary of the Company or the
Trustee.

                  "Participant" means, with respect to the Depositary, Euroclear
or Clearstream, a person who has an account with the Depositary, Euroclear or
Clearstream, respectively, and, with respect to the Depository Trust Company,
shall include Euroclear and Clearstream.

                  "Permitted Business" means the lines of business conducted by
the Company and its Restricted Subsidiaries on the date hereof and any business
incidental or reasonably related thereto or which is a reasonable extension
thereof as determined in good faith by the Company's Board of Directors and set
forth in an Officers' Certificate delivered to the Trustee.

                  "Permitted Debt" has the meaning assigned to it in Section
4.09(c).

                  "Permitted Investments" means (1) any Investment in the
Company or in any of its Restricted Subsidiaries; (2) any Investment in Cash
Equivalents; (3) any Investment by the Company or any of its Restricted
Subsidiaries in a person engaged in a Permitted Business, if as a result of such
Investment, (a) such person becomes one of the Company's Restricted
Subsidiaries; or (b) such person is merged, consolidated or amalgamated with or
into, or transfers or conveys substantially all of its assets to, or is
liquidated into, the Company or any of its Restricted Subsidiaries; (4) any
Investment made as a result of the receipt of non-cash consideration from an
Asset Sale that was made pursuant to and in compliance with Section 4.15; (5)
any acquisition of assets solely in exchange for the issuance of the Company's
Equity Interests (other than Disqualified Stock); (6) any Investments received
in compromise of obligations of such persons incurred in the ordinary course of
trade creditors or customers that were incurred in the ordinary course of
business, including pursuant to any plan of reorganization or similar
arrangement upon the bankruptcy or insolvency of any trade creditor or customer;
(7) Hedging Obligations permitted to be incurred under Section 4.09; and (8)
other Investments in any person having an aggregate fair market value (measured
on the date each such investment was made and without giving effect to
subsequent changes in value), when taken together with all other Investments
made pursuant to this clause (8) that are at the time outstanding, not to exceed
$15.0 million.

                                      -14-
<PAGE>

                  "Permitted Liens" means (1) Liens on assets of the Company and
any Guarantor securing Indebtedness pursuant to Credit Facilities; (2) Liens in
favor of the Company or the Guarantors; (3) Liens on property of a person
existing at the time such person is merged with or into or consolidated with the
Company or any of its Subsidiaries; provided, however, that such Liens were in
existence prior to the contemplation of such merger or consolidation and do not
extend to any assets other than those of the person merged into or consolidated
with the Company or the Subsidiary; (4) Liens on property existing at the time
of acquisition of the property by the Company or any of its Subsidiaries;
provided, however, that such Liens were in existence prior to the contemplation
of such acquisition; (5) Liens to secure the performance of statutory
obligations, surety or appeal bonds, performance bonds or other obligations of a
like nature incurred in the ordinary course of business; (6) Liens to secure
Indebtedness (including Capital Lease Obligations) permitted by Section
4.09(c)(iv) covering only the assets acquired with such Indebtedness; (7) Liens
existing on the Acquisition Closing Date; (8) Liens securing Indebtedness of the
Company's Foreign Restricted Subsidiaries that are not Guarantors in an
aggregate principal amount not to exceed $25.0 million, which Indebtedness is
permitted to be incurred pursuant to this Indenture; (9) Liens for taxes,
assessments or governmental charges or claims that are not yet delinquent or
that are being contested in good faith by appropriate proceedings promptly
instituted and diligently concluded, provided that any reserve or other
appropriate provision as is required in conformity with GAAP has been made
therefor; and (10) Liens incurred by the Company or any of its Restricted
Subsidiaries in the ordinary course of business with respect to obligations that
do not exceed $15.0 million at any one time outstanding.

                  "Permitted Refinancing Indebtedness" means any Indebtedness of
the Company or any of its Restricted Subsidiaries issued in exchange for, or the
net proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that (1) the principal amount
(or accreted value, if applicable) of such Permitted Refinancing Indebtedness
does not exceed the principal amount (or accreted value, if applicable) of the
Indebtedness extended, refinanced, renewed, replaced, defeased or refunded (plus
all accrued interest on the Indebtedness and the amount of all expenses and
premiums incurred in connection therewith); (2) such Permitted Refinancing
Indebtedness has a final maturity date later than the final maturity date of,
and has a Weighted Average Life to Maturity equal to or greater than the
Weighted Average Life to Maturity of, the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded; (3) if the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded is
subordinated in right of payment to the Notes, such Permitted Refinancing
Indebtedness has a final maturity date later than the final maturity date of,
and is subordinated in right of payment to, the Notes on terms at least as
favorable to the Holders of Notes as those contained in the documentation
governing the Indebtedness being extended, refinanced, renewed, replaced,
defeased or refunded; and (4) such Indebtedness is incurred either by the
Company or by the Restricted Subsidiary who is the obligor on the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded.

                                      -15-
<PAGE>

                  "person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization,
limited liability company or government or other entity.

                  "preferred stock" means, with respect to any person, any and
all shares, interests, participations or other equivalents, however designated,
whether voting or non-voting, of that person's equity that have a preference as
to the payment of dividends or as to payments upon a liquidation of that person,
whether now outstanding or issued after the date hereof, including without
limitation, all series and classes of such equity.

                  "Private Placement Legend" means the legend set forth in
Section 2.06(g)(i) to be placed on all Notes issued under this Indenture except
where otherwise permitted by the provisions of this Indenture.

                  "Purchase Agreement" mean the Purchase Agreement, dated as of
November 25, 2002, by and among Grant Prideco Escrow Corp., Grant Prideco, Inc.
and the Initial Purchasers, as such agreement may be amended, modified or
supplemented from time to time

                  "QIB" means a "qualified institutional buyer" as defined in
Rule 144A.

                  "Rating Agency" means each of S&P and Moody's, or if S&P or
Moody's or both shall not make a rating on the Notes publicly available, a
nationally recognized statistical rating agency or agencies, as the case may be,
selected by the Company (as certified by a resolution of the Company's Board of
Directors) which shall be substituted for S&P or Moody's, or both, as the case
may be.

                  "Rating Category" means (1) with respect to S&P, any of the
following categories: AAA, AA, A, BBB, BB, B, CCC, CC, C and D (or equivalent
successor categories); (2) with respect to Moody's any of the following
categories: Aaa, Aa, A, Baa, Ba, B, Caa, Ca and C (or equivalent successor
categories) and (3) the equivalent of any such category of S&P and Moody's used
by another Rating Agency. In determining whether the rating of the Notes has
decreased by one or more gradations, gradations within Rating Categories (+ and
- for S&P; 1, 2 and 3 for Moody's; or the equivalent gradations for another
Rating Agency) shall be taken into account (e.g., with respect to S&P, a decline
in a rating from BB+ to BB, as well from BB- to B, will constitute a decrease of
one gradation).

                  "Rating Decline" means (1) a decrease of two or more
gradations (including gradations within Rating Categories as well as between
Rating Categories) in the rating of the Notes by either Rating Agency or (2) a
withdrawal of the rating of the Notes by either Rating Agency, provided,
however, that such decrease or withdrawal occurs on, or within 90 days
following, the date of public notice of the occurrence of a Change of Control or
of the intention by the Company to effect a Change of Control, which period
shall be extended so long as

                                      -16-
<PAGE>

the rating of the Notes is under publicly announced consideration for downgrade
by either Rating Agency.

                  "Reference Period" means the latest two fiscal quarters for
which financial statements are publicly available.

                  "Registration Rights Agreement" means the Registration Rights
Agreement, dated as of December 4, 2002, by and among the parties named on the
signature pages thereof and the Initial Purchasers, as such agreement may be
amended, modified or supplemented from time to time and, with respect to any
Additional Notes, one or more registration rights agreements between the Company
and the other parties thereto, as such agreement(s) may be amended, modified or
supplemented from time to time, relating to rights given by the Company to the
purchasers of Additional Notes to register such Additional Notes under the
Securities Act.

                  "Regulation S" means Regulation S promulgated under the
Securities Act.

                  "Regulation S Global Note" means a Global Note in
substantially the form of Exhibit A hereto bearing the Global Note Legend and
the Private Placement Legend and deposited with or on behalf of and registered
in the name of the Depositary or its nominee, issued in a denomination equal to
the outstanding principal amount of the Notes initially sold in reliance on Rule
903 of Regulation S.

                  "Responsible Officer," when used with respect to the Trustee,
means any officer within the Corporate Trust Department of the Trustee (or any
successor group of the Trustee) or any other officer of the Trustee customarily
performing functions similar to those performed by any of the above designated
officers and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his or her
knowledge of and familiarity with the particular subject.

                  "Restricted Definitive Note" means a Definitive Note bearing
the Private Placement Legend.

                  "Restricted Global Note" means a permanent Global Note in
substantially the form of Exhibit A attached hereto that bears the Global Note
Legend and that has the "Schedule of Exchanges of Interests in the Global Note"
attached thereto, and that is deposited with or on behalf of and registered in
the name of the Depositary or a nominee of the Depositary, representing a series
of Notes that bear the Private Placement Legend.

                  "Restricted Investment" means an Investment other than a
Permitted Investment.

                  "Restricted Period" means the 40-day distribution compliance
period as defined in Regulation S.

                                      -17-
<PAGE>

                  "Restricted Subsidiary" of a person means any Subsidiary of
such person that is not an Unrestricted Subsidiary.

                  "Rule 144" means Rule 144 promulgated under the Securities
Act.

                  "Rule 144A" means Rule 144A promulgated under the Securities
Act.

                  "Rule 903" means Rule 903 promulgated under the Securities
Act.

                  "Rule 904" means Rule 904 promulgated the Securities Act.

                  "S&P" means Standard & Poor's Ratings Group, Inc., or any
successor to the rating agency business thereof.

                  "sale and leaseback transaction" of any person means an
arrangement with any lender or investor or to which such lender or investor is a
party providing for the leasing by such person of any property or asset of such
person which has been or is being sold or transferred by such person more than
365 days after the acquisition thereof or the completion of construction or
commencement of operation thereof to such lender or investor or to any person to
whom funds have been or are to be advanced by such lender or investor on the
security of such property or asset. The stated maturity of such arrangement is
the date of the last payment of rent or any other amount due under such
arrangement prior to the first date on which such arrangement may be terminated
by the lessee without payment of a penalty.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Shelf Registration Statement" means the Shelf Registration
Statement as defined in the Registration Rights Agreement.

                  "Significant Subsidiary" means any Subsidiary that would be a
"significant subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X,
promulgated pursuant to the Securities Act, as such Regulation is in effect on
the date hereof.

                  "Special Mandatory Redemption" has the meaning assigned to
such term in Section 3.09 hereof.

                  "Special Mandatory Redemption Date" means (a) March 25, 2003,
in the event that the Acquisition and Grant Prideco Assumption are not
consummated on or prior to February 28, 2003, or (b) the 20th day (or if such
day is not a Business Day, the next following Business Day) following the
termination of the Acquisition Agreement on or prior to the Deadline Date for
any reason.

                                      -18-
<PAGE>

                  "Special Mandatory Redemption Price" means 101% of the
offering price (i.e., 100% of the principal amount at maturity) of the Notes
plus accrued and unpaid interest up to but not including the Special Mandatory
Redemption Date.

                  "Stated Maturity" means, with respect to any installment of
interest or principal on any series of Indebtedness, the date on which the
payment of interest or principal was scheduled to be paid in the original
documentation governing such Indebtedness, and will not include any contingent
obligations to repay, redeem or repurchase any such interest or principal prior
to the date originally scheduled for the payment thereof.

                  "Subsidiary" means, with respect to any specified person: (1)
any corporation, association or other business entity of which more than 50% of
the total voting power of shares of Capital Stock entitled (without regard to
the occurrence of any contingency) to vote in the election of directors,
managers or trustees of the corporation, association or other business entity is
at the time owned or controlled, directly or indirectly, by that person or one
or more of the other Subsidiaries of that person (or a combination thereof); and
(2) any partnership (a) the sole general partner or the managing general partner
of which is such person or a Subsidiary of such person or (b) the only general
partners of which are that person or one or more Subsidiaries of that person (or
any combination thereof).

                  "Subsidiary Guarantee" means the guarantee of the Notes by
each of the Guarantors pursuant to this Indenture and in the form of the
guarantee endorsed on the form of guarantee attached as Exhibit E to this
Indenture and any additional guarantee of the Notes to be executed by any of the
Company's Subsidiaries pursuant to Section 4.12 hereof.

                  "Unrestricted Definitive Note" means one or more Definitive
Notes that do not bear and are not required to bear the Private Placement
Legend.

                  "Unrestricted Global Note" means a permanent Global Note in
substantially the form of Exhibit A attached hereto that bears the Global Note
Legend and that has the "Schedule of Exchanges of Interests in the Global Note"
attached thereto, and that is deposited with or on behalf of and registered in
the name of the Depositary or a nominee of the Depositary, representing a series
of Notes that do not bear the Private Placement Legend.

                  "Unrestricted Subsidiary" means any one of the Company's
Subsidiaries (or any successor to any of them) that is designated by the
Company's Board of Directors as an Unrestricted Subsidiary pursuant to a Board
Resolution, but only to the extent that such Subsidiary (1) has no Indebtedness
other than Non-Recourse Debt; (2) is not party to any agreement, contract,
arrangement or understanding with the Company or any of its Restricted
Subsidiaries unless the terms of any such agreement, contract, arrangement or
understanding are no less favorable to the Company or such Restricted Subsidiary
than those that might be obtained at the time from persons who are not
Affiliates of the Company or such Restricted Subsidiary; (3) is a person with
respect to which neither the Company nor any of its Restricted

                                      -19-
<PAGE>

Subsidiaries has any direct or indirect obligation (a) to subscribe for
additional Equity Interests or (b) to maintain or preserve such person's
financial condition or to cause such person to achieve any specified levels of
operating results; (4) has not guaranteed or otherwise directly or indirectly
provided credit support for any Indebtedness of the Company or any of its
Restricted Subsidiaries; and (5) has at least one director on its Board of
Directors that is not a director or executive officer of the Company or any of
its Restricted Subsidiaries and has at least one executive officer that is not a
director or executive officer of the Company or any of its Restricted
Subsidiaries.

                  "TIA" means the Trust Indenture Act of 1939, as amended.

                  "Voting Stock" of any person as of any date means the Capital
Stock of such person that is at the time entitled to vote in the election of the
Board of Directors of such person.

                  "Weatherford" means Weatherford International, Inc., a
Delaware corporation.

                  "Weighted Average Life to Maturity" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing: (1) the sum
of the products obtained by multiplying (a) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect of the Indebtedness,
by (b) the number of years (calculated to the nearest one-twelfth) that will
elapse between such date and the making of such payment; by (2) the then
outstanding principal amount of such Indebtedness.

Section 1.02. Other Definitions.

<Table>
<Caption>
TERM                                                                                   DEFINED IN SECTION
<S>                                                                                    <C>
"Affiliate Transaction"                                                                   Section 4.10
"Asset Sale Offer"                                                                        Section 4.10
"Authentication Order                                                                     Section 2.02
"Benefited Party"                                                                         Section 8.01
"Change of Control Offer"                                                                 Section 4.14
"Change of Control Payment"                                                               Section 4.14
"Change of Control Payment Date"                                                          Section 4.14
"Company"                                                                                 Preamble
"Covenant Defeasance"                                                                     Section 9.02
"Event of Default"                                                                        Section 6.01
"Excess Proceeds"                                                                         Section 4.15
"Holders"                                                                                 Preamble
"Indenture"                                                                               Preamble
</Table>

                                      -20-
<PAGE>

<Table>
<S>                                                                                       <C>
"Interest Payment Date"                                                                   Paragraph 1
                                                                                          of Note
"Legal Defeasance"                                                                        Section 9.02
"Offer Amount"                                                                            Section 3.08
"Offer Period"                                                                            Section 3.08
"Payment Default"                                                                         Section 6.01
"Purchase Date"                                                                           Section 3.08
"Reinstatement Date"                                                                      Section 4.20
"Repurchase Offer"                                                                        Section 3.08
"Suspended Covenants"                                                                     Section 4.20
"Trustee"                                                                                 Preamble
</Table>

Section 1.03. Incorporation by Reference of Trust Indenture Act.

                  (a) Whenever this Indenture refers to a provision of the TIA,
the provision is incorporated by reference in and made a part of this Indenture.

                  (b) The following TIA terms used in this Indenture have the
following meanings:

                  "indenture securities" means the Notes;

                  "indenture security holder" means a holder of a Note;

                  "indenture to be qualified" means this Indenture;

                  "indenture trustee" or "institutional trustee" means the
Trustee; and

                  "obligor" on the Notes means the Company and any successor
obligor upon the Notes.

                  (c) All other terms used in this Indenture that are defined by
the TIA, defined in the TIA by reference to another statute or defined by
Commission rule under the TIA have the meanings so assigned to them.

Section 1.04. Rules of Construction.

                  Unless the context otherwise requires:

                  (a) a term has the meaning assigned to it;

                  (b) an accounting term not otherwise defined has the meaning
         assigned to it in accordance with GAAP;

                                      -21-
<PAGE>

                  (c) "or" is not exclusive;

                  (d) words in the singular include the plural, and in the
         plural include the singular;

                  (e) "including" means "including without limitation";
         provisions apply to successive events and transactions; and

                  (f) references to sections of or rules under the Securities
         Act shall be deemed to include substitute, replacement or successor
         sections or rules adopted by the Commission from time to time.

                  (g) References in this Indenture to "Article" and "Section"
         shall be to the Articles and Sections of this Indenture unless
         expressly indicated otherwise.

                                   ARTICLE 2.

                                    THE NOTES

Section 2.01. Form and Dating.

                  (a) General. The Notes and the Trustee's certificate of
authentication shall be substantially in the form of Exhibit A hereto. The Notes
may have notations, legends or endorsements required by law, stock exchange rule
or usage. Each Note shall be dated the date of its authentication. The Notes
shall be in denominations of $1,000 and integral multiples thereof. The terms
and provisions contained in the Notes shall constitute, and are hereby expressly
made, a part of this Indenture and, to the extent applicable, the Company and
the Trustee, by their execution and delivery of this Indenture, expressly agree
to such terms and provisions and to be bound thereby. However, to the extent any
provision of any Note conflicts with the express provisions of this Indenture,
the provisions of this Indenture shall govern and be controlling.

                  (b) Form of Notes. Notes issued in global form shall be
substantially in the form of Exhibit A attached hereto (including the Global
Note Legend thereon and the "Schedule of Exchanges of Interests in the Global
Note" attached thereto). Notes issued in definitive form shall be substantially
in the form of Exhibit A attached hereto (but without the Global Note Legend
thereon and without the "Schedule of Exchanges of Interests in the Global Note"
attached thereto). Each Global Note shall represent such of the outstanding
Notes as shall be specified therein and each shall provide that it shall
represent the aggregate principal amount of outstanding Notes from time to time
endorsed thereon and that the aggregate principal amount of outstanding Notes
represented thereby may from time to time be reduced or increased, as
appropriate, to reflect exchanges and redemptions. Any endorsement of a Global
Note to reflect the amount of any increase or decrease in the aggregate
principal amount of outstanding Notes represented thereby shall be made by the
Trustee or the Custodian, at the

                                      -22-
<PAGE>

direction of the Trustee, in accordance with instructions given by the Holder
thereof as required by Section 2.06 hereof.

                  (c) Euroclear and Clearstream Procedures Applicable. The
provisions of the "Operating Procedures of the Euroclear System" and "Terms and
Conditions Governing Use of Euroclear" and the equivalent procedures of
Clearstream shall be applicable to transfers of beneficial interests in Global
Notes that are held by Participants through Euroclear or Clearstream.

                  (d) Subject to compliance with the provisions of Section 4.09,
the Company may issue Additional Notes under this Indenture after the Issue Date
in an unlimited aggregate principal amount.

Section 2.02. Execution and Authentication.

                  (a) One Officer shall sign the Notes for the Company by manual
or facsimile signature. The Company's seal may be reproduced on the Notes and
may be in facsimile form.

                  (b) If an Officer whose signature is on a Note no longer holds
that office at the time a Note is authenticated, the Note shall nevertheless be
valid.

                  (c) A Note shall not be valid until authenticated by the
manual signature of a Responsible Officer of the Trustee. The signature of a
Responsible Officer of the Trustee in the certificate of authentication on a
Note shall be conclusive evidence that the Note has been authenticated under
this Indenture.

                  (d) The Trustee shall, upon a written order of the Company
signed by an Officer (an "Authentication Order"), authenticate Notes for
original issue (i) on the Issue Date in the aggregate principal amount of
$175,000,000 and (ii) after the Issue Date, subject to compliance with the
provisions of Section 4.09, in an unlimited aggregate principal amount, in each
case upon a written order of the Company in the form of an Officers'
Certificate. Each such Officers' Certificate shall specify the amount of Notes
to be authenticated and the date on which the Notes are to be authenticated.
There shall be no limit on the aggregate principal amount of Notes that may be
outstanding at any time.

                  (e) The Trustee may appoint an authenticating agent acceptable
to the Company to authenticate Notes. An authenticating agent may authenticate
Notes whenever the Trustee may do so. Each reference in this Indenture to
authentication by the Trustee includes authentication by such agent. An
authenticating agent has the same rights as an Agent to deal with Holders or an
Affiliate of the Company.

                                      -23-
<PAGE>

Section 2.03. Registrar and Paying Agent.

                  (a) The Company shall maintain an office or agency where Notes
may be presented for registration of transfer or for exchange ("Registrar") and
an office or agency where Notes may be presented for payment ("Paying Agent").
The Registrar shall keep a register of the Notes and of their transfer and
exchange. The Company may appoint one or more co-registrars and one or more
additional paying agents. The term "Registrar" includes any co-registrar and the
term "Paying Agent" includes any additional paying agent. The Company may change
any Paying Agent or Registrar without notice to any Holder. The Company shall
notify the Trustee in writing of the name and address of any Agent not a party
to this Indenture. If the Company fails to appoint or maintain another entity as
Registrar or Paying Agent, the Trustee shall act as such. The Company or any of
its Subsidiaries may act as Paying Agent or Registrar.

                  (b) The Company initially appoints The Depository Trust
Company ("DTC") to act as Depositary with respect to the Global Notes.

                  (c) The Company initially appoints the Trustee to act as the
Registrar and Paying Agent and to act as Custodian with respect to the Global
Notes.

                  (d) The Global Notes shall be initially registered in the name
of Cede & Co., nominee of DTC.

Section 2.04. Paying Agent to Hold Money in Trust.

                  The Company shall require each Paying Agent other than the
Trustee to agree in writing that the Paying Agent shall hold in trust for the
benefit of Holders or the Trustee all money held by the Paying Agent for the
payment of principal of, and premium, Liquidated Damages, if any, or interest
on, the Notes, and shall notify the Trustee of any default by the Company in
making any such payment. While any such default continues, the Trustee may
require a Paying Agent to pay all money held by it to the Trustee. The Company
at any time may require a Paying Agent to pay all money held by it to the
Trustee. Upon payment over to the Trustee, the Paying Agent (if other than the
Company or a Subsidiary) shall have no further liability for the money. If the
Company or a Subsidiary acts as Paying Agent, it shall segregate and hold in a
separate trust fund for the benefit of the Holders all money held by it as
Paying Agent. Upon any bankruptcy or reorganization proceedings relating to the
Company, the Trustee shall serve as Paying Agent for the Notes.

Section 2.05. Holder Lists.

                  The Trustee shall preserve in as current a form as is
reasonably practicable the most recent list available to it of the names and
addresses of all Holders and shall otherwise comply with TIA Section 312(a). If
the Trustee is not the Registrar, the Company shall furnish to the Trustee at
least seven Business Days or such shorter time as the Trustee may allow before

                                      -24-
<PAGE>

each interest payment date and at such other times as the Trustee may request in
writing, a list in such form and as of such date, as the Trustee may reasonably
require of the names and addresses of the Holders of Notes, including the
aggregate principal amount of Notes held by each Holder.

Section 2.06. Transfer and Exchange.

                  (a) Transfer and Exchange of Global Notes. A Global Note may
not be transferred as a whole except by the Depositary to a nominee of the
Depositary, by a nominee of the Depositary to the Depositary or to another
nominee of the Depositary, or by the Depositary or any such nominee to a
successor Depositary or a nominee of such successor Depositary. Global Notes
will be exchanged by the Company for Definitive Notes if (i) the Depositary (x)
notifies the Company that it is unwilling or unable to continue to act as
depositary for the Global Notes and the Company thereupon fails to appoint a
successor Depositary, or (y) has ceased to be a clearing agency registered under
the Exchange Act and the Company fails to appoint a successor, and, in either
case, a successor Depositary is not appointed by the Company within 90 days
after the date of such notice from the Depositary, (ii) the Company in its sole
discretion determines that the Global Notes should be exchanged for Definitive
Notes and delivers a written notice to such effect to the Trustee, or (iii)
there has occurred and is continuing a Default or Event of Default. Upon the
occurrence of any of the preceding events in (i), (ii) or (iii) above,
Definitive Notes shall be issued in such names as the Depositary shall instruct
the Trustee. Global Notes also may be exchanged or replaced, in whole or in
part, as provided in Sections 2.07 and 2.10 hereof. Every Note authenticated and
delivered in exchange for, or in lieu of, a Global Note or any portion thereof,
pursuant to this Section 2.06 or Section 2.07 or 2.10 hereof, shall be
authenticated and delivered in the form of, and shall be, a Global Note. A
Global Note may not be exchanged for another Note other than as provided in
Sections 2.06(a), 2.07, 2.10 and 10.05 hereof, although beneficial interests in
a Global Note may be transferred and exchanged as provided in Section 2.06(b),
(c), (d) or (f) hereof.

                  (b) Transfer and Exchange of Beneficial Interests in the
Global Notes. The transfer and exchange of beneficial interests in the Global
Notes shall be effected through the Depositary, in accordance with the
provisions of this Indenture and the Applicable Procedures. Beneficial interests
in the Restricted Global Notes shall be subject to restrictions on transfer
comparable to those set forth herein to the extent required by the Securities
Act. Transfers of beneficial interests in the Global Notes also shall require
compliance with either subparagraph (i) or (ii) below, as applicable, as well as
one or more of the other following subparagraphs, as applicable:

                  (i) Transfer of Beneficial Interests in the Same Global Note.
         Beneficial interests in any Restricted Global Note may be transferred
         to persons who take delivery thereof in the form of a beneficial
         interest in the same Restricted Global Note in accordance with the
         transfer restrictions set forth in the Private Placement Legend;

                                      -25-
<PAGE>

         provided, however, that prior to the expiration of the Restricted
         Period, transfers of beneficial interests in the Regulation S Global
         Note may not be made to a U.S. person or for the account or benefit of
         a U.S. person (other than the Initial Purchasers). Beneficial interests
         in any Unrestricted Global Note may be transferred to persons who take
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note. No written orders or instructions shall be
         required to be delivered to the Registrar to effect the transfers
         described in this Section 2.06(b)(i).

                 (ii) All Other Transfers and Exchanges of Beneficial Interests
         in Global Notes. In connection with all transfers and exchanges of
         beneficial interests that are not subject to Section 2.06(b)(i) above,
         the transferor of such beneficial interest must deliver to the
         Registrar either (A) (1) a written order from a Participant or an
         Indirect Participant given to the Depositary in accordance with the
         Applicable Procedures directing the Depositary to credit or cause to be
         credited a beneficial interest in another Global Note in an amount
         equal to the beneficial interest to be transferred or exchanged and (2)
         instructions given in accordance with the Applicable Procedures
         containing information regarding the Participant account to be credited
         with such increase or (B), subject to Section 2.06(a), (1) a written
         order from a Participant or an Indirect Participant given to the
         Depositary in accordance with the Applicable Procedures directing the
         Depositary to cause to be issued a Definitive Note in an amount equal
         to the beneficial interest to be transferred or exchanged and (2)
         instructions given by the Depositary to the Registrar containing
         information regarding the person in whose name such Definitive Note
         shall be registered to effect the transfer or exchange referred to in
         (1) above. Upon consummation of an Exchange Offer by the Company in
         accordance with Section 2.06(f) hereof, the requirements of this
         Section 2.06(b)(ii) shall be deemed to have been satisfied upon receipt
         by the Registrar of the instructions contained in the Letter of
         Transmittal delivered by the Holder of such beneficial interests in the
         Restricted Global Notes. Upon satisfaction of all of the requirements
         for transfer or exchange of beneficial interests in Global Notes
         contained in this Indenture and the Notes or otherwise applicable under
         the Securities Act, the Trustee shall adjust the principal amount of
         the relevant Global Note(s) pursuant to Section 2.06(h) hereof.

                (iii) Transfer of Beneficial Interests to Another Restricted
         Global Note. A beneficial interest in any Restricted Global Note may be
         transferred to a person who takes delivery thereof in the form of a
         beneficial interest in another Restricted Global Note if the transfer
         complies with the requirements of Section 2.06(b)(ii) above and the
         Registrar receives the following:

                           (A) if the transferee shall take delivery in the form
                  of a beneficial interest in the 144A Global Note, then the
                  transferor must deliver a certificate in the form of Exhibit B
                  hereto, including the certifications in item (1) thereof; or

                                      -26-
<PAGE>

                           (B) if the transferee shall take delivery in the form
                  of a beneficial interest in the Regulation S Global Note, then
                  the transferor must deliver a certificate in the form of
                  Exhibit B hereto, including the certifications in item (2)
                  thereof.

                 (iv) Transfer and Exchange of Beneficial Interests in a
         Restricted Global Note for Beneficial Interests in the Unrestricted
         Global Note. A beneficial interest in any Restricted Global Note may be
         exchanged by any Holder thereof for a beneficial interest in an
         Unrestricted Global Note or transferred to a person who takes delivery
         thereof in the form of a beneficial interest in an Unrestricted Global
         Note if the exchange or transfer complies with the requirements of
         Section 2.06(b)(ii) above and:

                           (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the Holder of the beneficial interest to be
                  transferred, in the case of an exchange, or the transferee, in
                  the case of a transfer, certifies in the applicable Letter of
                  Transmittal that it is not (1) a broker-dealer, (2) a person
                  participating in the distribution of the Exchange Notes or (3)
                  a person who is an affiliate (as defined in Rule 144) of the
                  Company;

                           (B) such transfer is effected pursuant to the Shelf
                  Registration Statement in accordance with the Registration
                  Rights Agreement;

                           (C) such transfer is effected by a Participating
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights
                  Agreement; or

                           (D) the Registrar receives the following:

                                    (1) if the Holder of such beneficial
                           interest in a Restricted Global Note proposes to
                           exchange such beneficial interest for a beneficial
                           interest in an Unrestricted Global Note, a
                           certificate from such Holder in the form of Exhibit C
                           hereto, including the certifications in item (1)(a)
                           thereof; or

                                    (2) if the Holder of such beneficial
                           interest in a Restricted Global Note proposes to
                           transfer such beneficial interest to a person who
                           shall take delivery thereof in the form of a
                           beneficial interest in an Unrestricted Global Note, a
                           certificate from such Holder in the form of Exhibit B
                           hereto, including the certifications in item (4)
                           thereof;

                  and, in each such case set forth in this subparagraph (D), if
                  the Registrar, the Company or the Trustee so requests or if
                  the Applicable Procedures so require, an Opinion of Counsel in
                  form reasonably acceptable to the Registrar or the

                                      -27-
<PAGE>

                  Company, if applicable, to the effect that such exchange or
                  transfer is in compliance with the Securities Act and that the
                  restrictions on transfer contained herein and in the Private
                  Placement Legend are no longer required in order to maintain
                  compliance with the Securities Act.

                  If any such transfer is effected pursuant to subparagraph (B)
or (D) above at a time when a Restricted Global Note has not yet been issued,
the Company shall issue and, upon receipt of an Authentication Order in
accordance with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
aggregate principal amount of beneficial interests transferred pursuant to
subparagraph (B) or (D) above.

                  Beneficial interests in an Unrestricted Global Note cannot be
exchanged for, or transferred to persons who take delivery thereof in the form
of, a beneficial interest in a Restricted Global Note.

                  (c) Transfer or Exchange of Beneficial Interests for
Definitive Notes.

                  (i) Beneficial Interests in Restricted Global Notes to
Restricted Definitive Notes. Restricted Global Notes and beneficial interests
therein shall be exchangeable for Definitive Notes if (i) the Depositary (x)
notifies the Company that it is unwilling or unable to continue to act as
depositary for the Restricted Global Notes and the Company thereupon fails to
appoint a successor Depositary, or (y) has ceased to be a clearing agency
registered under the Exchange Act and the Company fails to appoint a successor,
and, in either case, a successor Depositary is not appointed by the Company
within 90 days after the date of such notice from the Depositary, (ii) the
Company, at its option, notifies the Trustee in writing that it elects to cause
the issuance of the Definitive Notes or (iii) there shall have occurred and be
continuing a Default with respect to the Notes. In all cases, Definitive Notes
delivered in exchange for any Restricted Global Note or beneficial interests
therein shall be registered in the names, and issued in any approved
denominations, requested by or on behalf of the Depositary (in accordance with
the Applicable Procedures).

                  In such event, the Trustee shall cause the Restricted Global
Notes to be canceled accordingly pursuant to Section 2.11 hereof, and the
Company shall execute and the Trustee shall authenticate and deliver to the
person designated a Definitive Note in the appropriate principal amount. Any
Definitive Note issued in exchange for a beneficial interest in a Restricted
Global Note pursuant to this Section 2.06(c) shall be registered in such name or
names and in such authorized denomination or denominations as the Holder of such
beneficial interest shall instruct the Registrar through instructions from the
Depositary and the Participant or Indirect Participant. The Trustee shall
deliver such Definitive Notes to the persons in whose names such Notes are so
registered. Any Definitive Note issued in exchange for a beneficial interest in
a Restricted Global Note pursuant to this Section 2.06(c)(i) shall bear the
Private Placement Legend and shall be subject to all restrictions on transfer
contained therein.

                                      -28-
<PAGE>

                  (ii) Beneficial Interests in Restricted Global Notes to
Unrestricted Definitive Notes. A Holder of a beneficial interest in a Restricted
Global Note may exchange such beneficial interest for an Unrestricted Definitive
Note or may transfer such beneficial interest to a person who takes delivery
thereof in the form of an Unrestricted Definitive Note only if:

                  (A) such exchange or transfer is effected pursuant to the
         Exchange Offer in accordance with the Registration Rights Agreement and
         the Holder of such beneficial interest, in the case of an exchange, or
         the transferee, in the case of a transfer, certifies in the Letter of
         Transmittal that it is not (1) a broker-dealer, (2) a person
         participating in the distribution of the Exchange Notes or (3) a person
         who is an affiliate (as defined in Rule 144) of the Company;

                  (B) such transfer is effected pursuant to the Shelf
         Registration Statement in accordance with the Registration Rights
         Agreement;

                  (C) such transfer is effected by a Broker-Dealer pursuant to
         the Exchange Offer Registration Statement in accordance with the
         Registration Rights Agreement; or

                  (D) the Registrar receives the following:

                           (1) if the Holder of such beneficial interest in a
                  Restricted Global Note proposes to exchange such beneficial
                  interest for a Definitive Note that does not bear the Private
                  Placement Legend, a certificate from such Holder in the form
                  of Exhibit C hereto, including the certifications in item
                  (1)(b) thereof; or

                           (2) if the Holder of such beneficial interest in a
                  Restricted Global Note proposes to transfer such beneficial
                  interest to a person who shall take delivery thereof in the
                  form of a Definitive Note that does not bear the Private
                  Placement Legend, a certificate from such Holder in the form
                  of Exhibit B hereto, including the certifications in item (4)
                  thereof;

         and, in each such case set forth in this subparagraph (D), if the
         Registrar, the Company or the Trustee so requests or if the Applicable
         Procedures so require, an Opinion of Counsel in form reasonably
         acceptable to the Registrar, the Trustee or the Company, if applicable,
         to the effect that such exchange or transfer is in compliance with the
         Securities Act and that the restrictions on transfer contained herein
         and in the Private Placement Legend are no longer required in order to
         maintain compliance with the Securities Act.

                  (iii) Beneficial Interests in Unrestricted Global Notes to
Unrestricted Definitive Notes. Unrestricted Global Notes and beneficial
interests therein shall be exchangeable for Definitive Notes if (i) the
Depositary (x) notifies the Company that it is unwilling or unable to continue
as depositary for the Unrestricted Global Notes, or (y) has ceased to be a

                                      -29-
<PAGE>

clearing agency registered under the Exchange Act and the Company fails to
appoint a successor, and, in either case, a successor Depositary is not
appointed by the Company within 90 days after the date of such notice from the
Depositary, (ii) the Company, at its option, notifies the Trustee in writing
that it elects to cause the issuance of the Definitive Notes or (iii) there
shall have occurred and be continuing a Default or Event of Default with respect
to the Notes. In all cases, Definitive Notes delivered in exchange for any
Unrestricted Global Note or beneficial interests therein will be registered in
the names, and issued in any approved denominations, requested by or on behalf
of the Depositary (in accordance with the Applicable Procedures). In such event,
the Trustee shall cause the Unrestricted Global Notes to be canceled accordingly
pursuant to Section 2.11 hereof, and the Company shall execute and, upon receipt
of an Authentication Order in accordance with Section 2.02 with respect to such
Note, the Trustee shall authenticate and deliver to the person designated in the
instructions a Definitive Note in the appropriate principal amount. Any
Definitive Note issued in exchange for a beneficial interest pursuant to this
Section 2.06(c)(iii) shall be registered in such name or names and in such
authorized denomination or denominations as the Holder of such beneficial
interest shall instruct the Registrar through instructions from the Depositary
and the Participant or Indirect Participant. The Trustee shall deliver such
Definitive Notes to the persons in whose names such Notes are so registered. Any
Definitive Note issued in exchange for a beneficial interest pursuant to this
Section 2.06(c)(iii) shall not bear the Private Placement Legend.

                  (d) Transfer and Exchange of Definitive Notes for Beneficial
Interests.

                  (i) Restricted Definitive Notes to Beneficial Interests in
Restricted Global Notes. If any Holder of a Restricted Definitive Note proposes
to exchange such Note for a beneficial interest in a Restricted Global Note or
to transfer such Restricted Definitive Notes to a person who takes delivery
thereof in the form of a beneficial interest in a Restricted Global Note, then,
upon receipt by the Registrar of the following documentation:

                  (A) if the Holder of such Restricted Definitive Note proposes
         to exchange such Note for a beneficial interest in a Restricted Global
         Note, a certificate from such Holder in the form of Exhibit C hereto,
         including the certifications in item (2)(b) thereof;

                  (B) if such Restricted Definitive Note is being transferred to
         a QIB in accordance with Rule 144A under the Securities Act, a
         certificate to the effect set forth in Exhibit B hereto, including the
         certifications in item (1) thereof;

                  (C) if such Restricted Definitive Note is being transferred to
         a Non-U.S. person in an offshore transaction in accordance with Rule
         903 or Rule 904 under the Securities Act, a certificate to the effect
         set forth in Exhibit B hereto, including the certifications in item (2)
         thereof;

                                      -30-
<PAGE>

                  (D) if such Restricted Definitive Note is being transferred
         pursuant to an exemption from the registration requirements of the
         Securities Act in accordance with Rule 144 under the Securities Act to
         a person who is an affiliate (as defined in Rule 144) of the Company, a
         certificate to the effect set forth in Exhibit B hereto, including the
         certifications in item (3)(a) thereof;

                  (E) if such Restricted Definitive Note is being transferred to
         an Institutional Accredited Investor in reliance on an exemption from
         the registration requirements of the Securities Act other than those
         listed in subparagraphs (B) through (D) above, a certificate to the
         effect set forth in Exhibit B hereto, including the certifications,
         certificates and Opinion of Counsel required by item (3) thereof, if
         applicable; or

                  (F) if such Restricted Definitive Note is being transferred to
         the Company or any of its Subsidiaries, a certificate to the effect set
         forth in Exhibit B hereto, including the certifications in item (3)(b)
         thereof,

the Trustee shall cancel the Restricted Definitive Note, and increase or cause
to be increased the aggregate principal amount of, in the case of clause (A)
above, the appropriate Restricted Global Note, in the case of clause (B) above,
the 144A Global Note, in the case of clause (C) above, the Regulation S Global
Note, in the case of clauses (D) through (F) above, the appropriate Restricted
Global Note in accordance with Section 2.11 hereof.

                 (ii) Restricted Definitive Notes to Beneficial Interests in
Unrestricted Global Notes. A Holder of a Restricted Definitive Note may exchange
such Note for a beneficial interest in an Unrestricted Global Note or transfer
such Restricted Definitive Note to a person who takes delivery thereof in the
form of a beneficial interest in an Unrestricted Global Note only if:

                  (A) such exchange or transfer is effected pursuant to the
         Exchange Offer in accordance with the Registration Rights Agreement and
         the Holder, in the case of an exchange, or the transferee, in the case
         of a transfer, certifies in the applicable Letter of Transmittal that
         it is not (1) a broker-dealer, (2) a person participating in the
         distribution of the Exchange Notes or (3) a person who is an affiliate
         (as defined in Rule 144) of the Company;

                  (B) such transfer is effected pursuant to the Shelf
         Registration in accordance with the Registration Rights Agreement;

                  (C) such transfer is effected by a Broker-Dealer pursuant to
         the Exchange Offer Registration Statement in accordance with the
         Registration Rights Agreement; or

                                      -31-
<PAGE>

                  (D) the Registrar receives the following:

                           (1) if the Holder of such Definitive Notes proposes
                  to exchange such Notes for a beneficial interest in the
                  Unrestricted Global Note, a certificate from such Holder in
                  the form of Exhibit C hereto, including the certifications in
                  item (1)(c) thereof; or

                           (2) if the Holder of such Definitive Notes proposes
                  to transfer such Notes to a person who shall take delivery
                  thereof in the form of a beneficial interest in the
                  Unrestricted Global Note, a certificate from such Holder in
                  the form of Exhibit B hereto, including the certifications in
                  item (4) thereof;

         and, in each such case set forth in this subparagraph (D), if the
         Registrar, the Trustee or the Company so requests or if the Applicable
         Procedures so require, an Opinion of Counsel in form reasonably
         acceptable to the Registrar, the Trustee or the Company, if applicable,
         to the effect that such exchange or transfer is in compliance with the
         Securities Act and that the restrictions on transfer contained herein
         and in the Private Placement Legend are no longer required in order to
         maintain compliance with the Securities Act.

                  Upon satisfaction of the conditions of any of the
subparagraphs in this Section 2.06(d)(ii), the Trustee shall cancel the
Definitive Notes and increase or cause to be increased the aggregate principal
amount of the Unrestricted Global Note.

                  (iii) Unrestricted Definitive Notes to Beneficial Interests in
Unrestricted Global Notes. A Holder of an Unrestricted Definitive Note may
exchange such Note for a beneficial interest in an Unrestricted Global Note or
transfer such Definitive Notes to a person who takes delivery thereof in the
form of a beneficial interest in an Unrestricted Global Note at any time. Upon
receipt of a request for such an exchange or transfer, the Trustee shall cancel
the applicable Unrestricted Definitive Note and increase or cause to be
increased the aggregate principal amount of one of the Unrestricted Global
Notes.

                  If any such exchange or transfer from a Definitive Note to a
beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D) or
(iii) above at a time when an Unrestricted Global Note has not yet been issued,
the Company shall issue and, upon receipt of an Authentication Order in
accordance with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
principal amount of Definitive Notes so transferred.

                  (e) Transfer and Exchange of Definitive Notes for
Definitive Notes. Upon request by a Holder of Definitive Notes and such Holder's
compliance with the provisions of this Section 2.06(e), the Registrar shall
register the transfer or exchange of Definitive Notes. Prior to such
registration of transfer or exchange, the requesting Holder shall present or

                                      -32-
<PAGE>

surrender to the Registrar the Definitive Notes duly endorsed or accompanied by
a written instruction of transfer in form satisfactory to the Registrar duly
executed by such Holder or by his attorney, duly authorized in writing. In
addition, the requesting Holder shall provide any additional certifications,
documents and information, as applicable, required pursuant to the following
provisions of this Section 2.06(e):

                  (i) Restricted Definitive Notes to Restricted Definitive
         Notes. Any Restricted Definitive Note may be transferred to and
         registered in the name of persons who take delivery thereof in the form
         of a Restricted Definitive Note if the Registrar receives the
         following:

                           (A) if the transfer shall be made pursuant to Rule
                  144A under the Securities Act, then the transferor must
                  deliver a certificate in the form of Exhibit B hereto,
                  including the certifications in item (1) thereof; and

                           (B) if the transfer shall be made pursuant to Rule
                  903 or Rule 904, then the transferor must deliver a
                  certificate in the form of Exhibit B hereto, including the
                  certifications in item (2) thereof; and

                           (C) if the transfer shall be made pursuant to any
                  other exemption from the registration requirements of the
                  Securities Act, then the transferor must deliver a certificate
                  in the form of Exhibit B hereto, including the certifications,
                  certificates and Opinion of Counsel required by item (3)
                  thereof, if applicable.

                 (ii) Restricted Definitive Notes to Unrestricted Definitive
         Notes. Any Restricted Definitive Note may be exchanged by the Holder
         thereof for an Unrestricted Definitive Note or transferred to a person
         or persons who take delivery thereof in the form of an Unrestricted
         Definitive Note if:

                           (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the Holder, in the case of an exchange, or the
                  transferee, in the case of a transfer, certifies in the
                  applicable Letter of Transmittal that it is not (1) a
                  broker-dealer, (2) a person participating in the distribution
                  of the Exchange Notes or (3) a person who is an affiliate (as
                  defined in Rule 144) of the Company;

                           (B) any such transfer is effected pursuant to the
                  Shelf Registration Statement in accordance with the
                  Registration Rights Agreement;

                           (C) any such transfer is effected by a Participating
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights
                  Agreement; or

                                      -33-
<PAGE>

                           (D) the Registrar receives the following:

                                    (1) if the Holder of such Restricted
                           Definitive Notes proposes to exchange such Notes for
                           an Unrestricted Definitive Note, a certificate from
                           such Holder in the form of Exhibit C hereto,
                           including the certifications in item (1)(d) thereof;
                           or

                                    (2) if the Holder of such Restricted
                           Definitive Notes proposes to transfer such Notes to a
                           person who shall take delivery thereof in the form of
                           an Unrestricted Definitive Note, a certificate from
                           such Holder in the form of Exhibit B hereto,
                           including the certifications in item (4) thereof;

                  and, in each such case set forth in this subparagraph (D), if
                  the Registrar, the Trustee or the Company so requests, an
                  Opinion of Counsel in form reasonably acceptable to the
                  Registrar, the Trustee and the Company, if applicable, to the
                  effect that such exchange or transfer is in compliance with
                  the Securities Act and that the restrictions on transfer
                  contained herein and in the Private Placement Legend are no
                  longer required in order to maintain compliance with the
                  Securities Act.

                  (iii) Unrestricted Definitive Notes to Unrestricted Definitive
         Notes. A Holder of Unrestricted Definitive Notes may transfer such
         Notes to a person who takes delivery thereof in the form of an
         Unrestricted Definitive Note. Upon receipt of a request to register
         such a transfer, the Registrar shall register the transfer of the
         Unrestricted Definitive Notes pursuant to the instructions from the
         Holder thereof.

                  (f) Exchange Offer. Upon the occurrence of the Exchange Offer
in accordance with the Registration Rights Agreement, the Company shall issue
and, upon receipt of an Authentication Order in accordance with Section 2.02,
the Trustee shall authenticate (i) one or more Unrestricted Global Notes in an
aggregate principal amount equal to the principal amount of the beneficial
interests in the Restricted Global Notes tendered for acceptance by persons that
certify in the applicable Letters of Transmittal that (x) they are not
broker-dealers, (y) they are not participating in a distribution of the Exchange
Notes and (z) they are not affiliates (as defined in Rule 144) of the Company,
and accepted for exchange in the Exchange Offer and (ii) Unrestricted Definitive
Notes in an aggregate principal amount equal to the principal amount of the
Restricted Definitive Notes accepted for exchange in the Exchange Offer.
Concurrently with the issuance of such Notes, the Trustee shall cause the
aggregate principal amount of the applicable Restricted Global Notes to be
reduced accordingly, and the Company shall execute and, upon receipt of an
Authentication Order in accordance with Section 2.02 with respect to such Notes,
the Trustee shall authenticate and deliver to the persons designated by the
Holders of Definitive Notes so accepted Unrestricted Definitive Notes in the
appropriate principal amount.

                                      -34-
<PAGE>

                  (g) Legends. The following legends shall appear on the face of
all Global Notes and Definitive Notes issued under this Indenture unless
specifically stated otherwise in the applicable provisions of this Indenture.

                  (i) Private Placement Legend.

                  (A) Except as permitted by subparagraph (B) below, each Global
         Note and each Definitive Note (and all Notes issued in exchange
         therefor or substitution thereof) shall bear the legend in
         substantially the following form:

                  THIS NOTE HAS NOT BEEN REGISTERED UNDER THE U.S. SECURITIES
                  ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND,
                  ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED
                  STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS
                  EXCEPT AS SET FORTH BELOW. BY ITS ACQUISITION HEREOF, THE
                  HOLDER (1) REPRESENTS THAT (A) IT IS A "QUALIFIED
                  INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE
                  SECURITIES ACT) OR (B) IT IS NOT A U.S. PERSON AND IS
                  ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION IN COMPLIANCE
                  WITH RULE 904 UNDER THE SECURITIES ACT, (2) AGREES THAT IT
                  WILL NOT WITHIN TWO YEARS AFTER THE ORIGINAL ISSUANCE OF THIS
                  NOTE RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO
                  GRANT PRIDECO, INC. OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE
                  UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE
                  WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED
                  STATES TO AN ACCREDITED INVESTOR (AS DEFINED IN RULE
                  501(a)(1), (2), (3), OR (7) UNDER THE SECURITIES ACT (AN
                  "ACCREDITED INVESTOR")) THAT, PRIOR TO SUCH TRANSFER,
                  FURNISHES (OR HAS FURNISHED ON ITS BEHALF BY A U.S.
                  BROKER-DEALER) TO THE TRUSTEE A SIGNED LETTER CONTAINING
                  CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE
                  RESTRICTIONS ON TRANSFER OF THIS NOTE (THE FORM OF WHICH
                  LETTER CAN BE OBTAINED FROM THE TRUSTEE FOR THIS NOTE), (D)
                  OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN
                  COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT (IF
                  AVAILABLE), (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION
                  PROVIDED BY RULE 144 UNDER THE SECURITIES ACT (IF AVAILABLE),
                  (F) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION
                  REQUIREMENTS OF THE SECURITIES ACT

                                      -35-
<PAGE>

                  (AND BASED UPON AN OPINION OF COUNSEL IF GRANT PRIDECO, INC.
                  SO REQUESTS), OR (G) PURSUANT TO AN EFFECTIVE REGISTRATION
                  STATEMENT UNDER THE SECURITIES ACT AND (3) AGREES THAT IT WILL
                  GIVE TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE
                  SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH
                  ANY TRANSFER OF THIS NOTE WITHIN TWO YEARS AFTER THE ORIGINAL
                  ISSUANCE OF THIS NOTE, IF THE PROPOSED TRANSFEREE IS AN
                  ACCREDITED INVESTOR, THE HOLDER MUST, PRIOR TO SUCH TRANSFER,
                  FURNISH TO THE TRUSTEE AND GRANT PRIDECO, INC. SUCH
                  CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER
                  OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER
                  IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A
                  TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF
                  THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE
                  TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE THE
                  MEANING GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES
                  ACT.

                  (B) Notwithstanding the foregoing, any Global Note or
         Definitive Note issued pursuant to subparagraphs (b)(iv), (c)(ii),
         (c)(iii), (d)(ii), (d)(iii), (e)(ii) or (e)(iii) to this Section 2.06
         (and all Notes issued in exchange therefor or substitution thereof)
         shall not bear the Private Placement Legend.

                  (ii) Global Note Legend. Each Global Note shall bear a legend
         in substantially the following form:

                  "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE
                  INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR
                  THE BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT
                  TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT
                  (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE
                  REQUIRED PURSUANT TO SECTION 2.06 OF THE INDENTURE, (II) THIS
                  GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT
                  TO SECTION 2.06(a) OF THE INDENTURE, (III) THIS GLOBAL NOTE
                  MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO
                  SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE
                  TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN
                  CONSENT OF THE COMPANY."

                                      -36-
<PAGE>

                  "UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR
                  NOTES IN DEFINITIVE FORM, THIS NOTE MAY NOT BE TRANSFERRED
                  EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE
                  DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY
                  OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR
                  ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF
                  SUCH SUCCESSOR DEPOSITARY. UNLESS THIS CERTIFICATE IS
                  PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY
                  TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"),
                  TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER,
                  EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED
                  IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE
                  REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY
                  PAYMENT IS MADE TO CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE
                  REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
                  TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY
                  OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
                  HEREOF, CEDE & CO., HAS AN INTEREST HEREIN."

                  (h) Cancellation or Adjustment of Global Notes. At such time
as all beneficial interests in a particular Global Note have been exchanged for
Definitive Notes or a particular Global Note has been redeemed, repurchased or
cancelled in whole and not in part, each such Global Note shall be returned to
or retained and cancelled by the Trustee in accordance with Section 2.11 hereof.
At any time prior to such cancellation, if any beneficial interest in a Global
Note is exchanged for or transferred to a person who shall take delivery thereof
in the form of a beneficial interest in another Global Note or for Definitive
Notes, the principal amount of Notes represented by such Global Note shall be
reduced accordingly and an endorsement shall be made on such Global Note by the
Trustee or by the Depositary at the direction of the Trustee to reflect such
reduction; and if the beneficial interest is being exchanged for or transferred
to a person who shall take delivery thereof in the form of a beneficial interest
in another Global Note, such other Global Note shall be increased accordingly
and an endorsement shall be made on such Global Note by the Trustee or by the
Depositary at the direction of the Trustee to reflect such increase.

                                      -37-
<PAGE>

                  (i) General Provisions Relating to Transfers and Exchanges.

                  (i) To permit registrations of transfers and exchanges, the
Company shall execute and, upon receipt of an Authentication Order in accordance
with Section 2.02 with respect to such Notes, the Trustee shall authenticate
Global Notes and Definitive Notes upon the Company's order or at the Registrar's
request.

                  (ii) No service charge shall be made to a Holder of a
beneficial interest in a Global Note or to a Holder of a Definitive Note for any
registration of transfer or exchange, but the Company may require payment of a
sum sufficient to cover any transfer tax or similar governmental charge payable
in connection therewith (other than any such transfer taxes or similar
governmental charge payable upon exchange or transfer pursuant to Sections 2.10,
3.06, 4.16 and 10.05 hereof).

                  (iii) The Registrar shall not be required to register the
transfer of or exchange any Note selected for redemption in whole or in part,
except the unredeemed portion of any Note being redeemed in part.

                  (iv) All Global Notes and Definitive Notes issued upon any
registration of transfer or exchange of Global Notes or Definitive Notes shall
be the valid obligations of the Company, evidencing the same debt, and entitled
to the same benefits under this Indenture, as the Global Notes or Definitive
Notes surrendered upon such registration of transfer or exchange.

                  (v) The Company shall not be required (A) to issue, to
register the transfer of or to exchange any Notes during a period beginning at
the opening of business 15 days before the day of any selection of Notes for
redemption under Section 3.02 hereof and ending at the close of business on the
day of selection, (B) to register the transfer of or to exchange any Note so
selected for redemption in whole or in part, except the unredeemed portion of
any Note being redeemed in part or (c) to register the transfer of or to
exchange a Note between a record date and the next succeeding interest payment
date.

                  (vi) Prior to due presentment for the registration of a
transfer of any Note, the Trustee, any Agent and the Company may deem and treat
the person in whose name any Note is registered on the registry relating to the
Notes as the absolute owner of such Note for the purpose of receiving payment of
principal of and interest on such Notes and for all other purposes, and none of
the Trustee, any Agent or the Company shall be affected by notice to the
contrary.

                  (vii) The Trustee shall authenticate Global Notes and
Definitive Notes in accordance with the provisions of Section 2.02 hereof.

                                      -38-
<PAGE>

                  (viii) All certifications, certificates and Opinions of
Counsel required to be submitted to the Registrar, the Company and the Trustee
pursuant to this Section 2.06 to effect a registration of transfer or exchange
may be submitted by facsimile.

                  Notwithstanding anything herein to the contrary, as to any
certifications and certificates delivered to the Trustee or the Registrar
pursuant to this Section 2.06, the Trustee's and the Registrar's duties shall be
limited to confirming that any such certifications and certificates delivered to
it are in the form of Exhibits B or C hereto. Neither the Trustee nor the
Registrar shall be responsible for confirming the truth or accuracy of any
representations or warranties made in any such certifications or certificates.

Section 2.07. Replacement Notes.

                  (a) If any mutilated Note is surrendered to the Trustee or the
Company and the Trustee receives evidence to its satisfaction of the
destruction, loss or theft of any Note, the Company shall issue and the Trustee,
upon receipt of an Authentication Order in accordance with Section 2.02 with
respect to such Note, shall authenticate a replacement Note if the Trustee's
requirements are met. If required by the Trustee or the Company, an indemnity
bond must be supplied by the Holder that is sufficient in the judgment of the
Trustee and the Company to protect the Company, the Trustee, any Agent and any
authenticating agent from any loss that any of them may suffer if a Note is
replaced. The Company may charge for its expenses in replacing a Note.

                  (b) Every replacement Note is an additional obligation of the
Company and shall be entitled to all of the benefits of this Indenture equally
and proportionately with all other Notes duly issued hereunder.

Section 2.08. Outstanding Notes.

                  (a) The Notes outstanding at any time are all the Notes
authenticated by the Trustee except for those cancelled by it, those delivered
to it for cancellation, those reductions in the interest in a Global Note
effected by the Trustee in accordance with the provisions hereof, and those
described in this Section 2.08 as not outstanding. Except as set forth in
Section 2.09 hereof, a Note does not cease to be outstanding because the Company
or an Affiliate of the Company holds the Note.

                  (b) If a Note is replaced pursuant to Section 2.07 hereof, it
ceases to be outstanding and interest on that Note ceases to accrue unless the
Trustee receives proof satisfactory to it that the replaced Note is held by a
bona fide purchaser.

                  (c) If the principal amount of any Note is considered paid
under Section 4.01 hereof, it ceases to be outstanding and interest on it ceases
to accrue.

                                      -39-
<PAGE>

                  (d) If the Paying Agent (other than the Company, a
Subsidiary or an Affiliate of any thereof) holds, on a redemption date or
maturity date, money sufficient to pay Notes payable on that date, then on and
after that date such Notes shall be deemed to be no longer outstanding and shall
cease to accrue interest.

Section 2.09. Treasury Notes.

                  In determining whether the Holders of the required principal
amount of Notes have concurred in any direction, waiver or consent, Notes owned
by the Company, or by any person directly or indirectly controlling or
controlled by or under direct or indirect common control with the Company, shall
be considered as though not outstanding, except that for the purposes of
determining whether the Trustee shall be protected in relying on any such
direction, waiver or consent, only Notes that the Trustee knows are so owned
shall be so disregarded.

Section 2.10. Temporary Notes.

                  Until certificates representing Notes are ready for delivery,
the Company may prepare and the Trustee, upon receipt of an Authentication Order
in accordance with Section 2.02 with respect to such Notes, shall authenticate
temporary Notes. Temporary Notes shall be substantially in the form of
Definitive Notes but may have variations that the Company considers appropriate
for temporary Notes and as shall be reasonably acceptable to the Trustee.
Without unreasonable delay, the Company shall prepare and, upon receipt of an
Authentication Order in accordance with Section 2.02 with respect to such Notes,
the Trustee shall authenticate definitive Notes in exchange for temporary Notes.
After the preparation of Definitive Notes, the temporary Notes shall be
exchangeable for Definitive Notes upon surrender of the temporary Notes at the
office or agency of the Company designated for such purpose pursuant to Section
4.02 without charge to the Holder. Upon surrender for cancellation of any one or
more temporary Notes, the Company shall execute and, upon receipt of an
Authentication Order in accordance with Section 2.02 with respect to such Notes,
the Trustee shall authenticate and deliver in exchange therefor a like principal
amount of Definitive Notes of authorized denominations.

                  Holders of temporary Notes shall be entitled to all of the
benefits of this Indenture.

Section 2.11. Cancellation.

                  The Company at any time may deliver Notes to the Trustee for
cancellation. The Registrar and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee, upon direction by the Company and no one else, shall cancel all Notes
surrendered for registration of transfer, exchange, payment, replacement or
cancellation and shall destroy cancelled Notes (subject to the record

                                      -40-
<PAGE>

retention requirements of the Exchange Act). Certification of the destruction of
all cancelled Notes shall be delivered to the Company. The Company may not issue
new Notes to replace Notes that it has paid or that have been delivered to the
Trustee for cancellation.

Section 2.12. Defaulted Interest.

                  If the Company defaults in a payment of interest on the Notes,
it shall pay the defaulted interest in any lawful manner plus, to the extent
lawful, interest payable on the defaulted interest, to the persons who are
Holders on a subsequent special record date, in each case at the rate provided
in the Notes and in Section 4.01 hereof. The Company shall notify the Trustee in
writing of the amount of defaulted interest proposed to be paid on each Note and
the date of the proposed payment. The Company shall fix or cause to be fixed
each such special record date and payment date; provided, however, that no such
special record date shall be less than 5 days prior to the related payment date
for such defaulted interest. At least 10 days before the special record date,
the Company (or, upon the written request of the Company, the Trustee in the
name and at the expense of the Company) shall mail or cause to be mailed to
Holders a notice that states the special record date, the related payment date
and the amount of such interest to be paid.

Section 2.13. CUSIP Numbers.

                  The Company in issuing the Notes may use "CUSIP" numbers (if
then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in
notices of redemption as a convenience to Holders; provided, however, that any
such notice may state that no representation is made as to the correctness of
such numbers either as printed on the Notes or as contained in any notice of a
redemption and that reliance may be placed only on the other identification
numbers printed on the Notes, and any such redemption shall not be affected by
any defect in or omission of such numbers. The Company will promptly notify the
Trustee of any change in the "CUSIP" numbers.

                                   ARTICLE 3.

                            REDEMPTION AND PREPAYMENT

Section 3.01. Notices to Trustee.

                  If the Company elects to redeem Notes pursuant to the optional
redemption provisions of Section 3.07 hereof, it shall furnish to the Trustee,
at least 45 days (unless a shorter period shall be agreed to by the Trustee in
writing) but not more than 75 days before a redemption date (but in any event
prior to the notice provided pursuant to Section 3.03 hereof), an Officers'
Certificate setting forth (i) the clause of this Indenture pursuant to which the
redemption shall occur, (ii) the redemption date, (iii) the principal amount of
Notes to be redeemed and (iv) the redemption price.

                                      -41-
<PAGE>

Section 3.02. Selection of Notes to Be Redeemed.

                  If less than all of the Notes are to be redeemed or purchased
at any time, the Trustee shall select the Notes to be redeemed or purchased
among the Holders of the Notes in compliance with the requirements of the
principal national securities exchange, if any, on which the Notes are listed
or, if the Notes are not so listed, on a pro rata basis, by lot or in accordance
with any other method the Trustee considers fair and appropriate; provided,
however, that if a partial redemption is made with the proceeds of an Equity
Offering, selection of the Notes or portions thereof for redemption shall be
made by the Trustee only on a pro rata basis or on as nearly a pro rata basis as
is practicable (subject to the procedures of the Depository), unless such method
is prohibited. Any such determination by the Trustee shall be conclusive. In the
event of partial redemption by lot, the particular Notes to be redeemed shall be
selected, unless otherwise provided herein, not less than 30 nor more than 60
days prior to the redemption date by the Trustee from the outstanding Notes not
previously called for redemption.

                  The Trustee shall promptly notify the Company in writing of
the Notes selected for redemption and, in the case of any Note selected for
partial redemption, the principal amount thereof to be redeemed. Notes and
portions of Notes selected shall be in amounts of $1,000 or whole multiples of
$1,000; except that if all of the Notes of a Holder are to be redeemed, the
entire outstanding amount of Notes held by such Holder, even if not a multiple
of $1,000, shall be redeemed. Except as provided in the preceding sentence,
provisions of this Indenture that apply to Notes called for redemption also
apply to portions of Notes called for redemption.

Section 3.03. Notice of Redemption.

                  Subject to the provisions of Sections 3.07 and 3.08 hereof, at
least 30 days but not more than 60 days before an optional redemption date, the
Company shall mail or cause to be mailed, by first class mail, a notice of
redemption to each Holder whose Notes are to be redeemed at its registered
address.

                  The notice shall identify the Notes to be redeemed and shall
state:

                  (a) the redemption date;

                  (b) the redemption price;

                  (c) if any Note is being redeemed in part, the portion of the
         principal amount of such Note to be redeemed and that, after the
         redemption date upon surrender of such Note, a new Note or Notes in
         principal amount equal to the unredeemed portion shall be issued upon
         cancellation of the original Note;

                  (d) the name and address of the Paying Agent;

                                      -42-
<PAGE>

                  (e) that Notes called for redemption must be surrendered to
         the Paying Agent to collect the redemption price;

                  (f) that, unless the Company defaults in making such
         redemption payment, interest on Notes called for redemption ceases to
         accrue on and after the redemption date;

                  (g) the paragraph of the Notes or Section of this Indenture
         pursuant to which the Notes called for redemption are being redeemed,
         and;

                  (h) that no representation is made as to the correctness or
         accuracy of the CUSIP number, if any, listed in such notice or printed
         on the Notes.

                  At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company shall have delivered to the Trustee at least 30 days (unless a shorter
period shall be agreed to by the Trustee in writing) but not more than 60 days
prior to the redemption date, an Officers' Certificate requesting that the
Trustee give such notice and setting forth the information to be stated in such
notice as provided in the preceding paragraph.

Section 3.04. Effect of Notice of Redemption.

                  Once notice of redemption is mailed in accordance with Section
3.03 hereof, Notes called for redemption shall become irrevocably due and
payable on the redemption date at the redemption price. A notice of redemption
may not be conditional.

                  A notice of redemption shall be deemed to be given when
mailed, whether or not the Holder receives the notice. In any event, failure to
give such notice, or any defect in such notice, shall not affect the validity of
the proceedings for the redemption of the Notes held by Holders to whom such
notice was properly given.

Section 3.05. Deposit of Redemption Price.

                  On or prior to the redemption date, the Company shall deposit
with the Trustee or with the Paying Agent money sufficient to pay the redemption
price of and accrued interest on all Notes to be redeemed on that date. The
Trustee or the Paying Agent shall promptly return to the Company any money
deposited with the Trustee or the Paying Agent by the Company in excess of the
amounts necessary to pay the redemption price of, and accrued interest on, all
Notes to be redeemed.

                  If the Company complies with the provisions of the preceding
paragraph, on and after the redemption date, interest shall cease to accrue on
the Notes or the portions of Notes called for redemption. If a Note is redeemed
on or after an interest record date but on or prior to the related interest
payment date, then any accrued and unpaid interest shall be paid

                                      -43-
<PAGE>

to the person in whose name such Note was registered at the close of business on
such record date. If any Note called for redemption shall not be so paid upon
surrender for redemption because of the failure of the Company to comply with
the preceding paragraph, interest shall be paid on the unpaid principal from the
redemption date until such principal is paid, and to the extent lawful on any
interest not paid on such unpaid principal, in each case at the rate provided in
the Notes and in Section 4.01 hereof.

Section 3.06. Notes Redeemed in Part.

                  Upon surrender of a Note that is redeemed in part, the Company
shall issue and, upon receipt of an Authentication Order in accordance with
Section 2.02 with respect to such Notes, the Trustee shall authenticate for the
Holder at the expense of the Company a new Note equal in principal amount to the
unredeemed portion of the Note surrendered.

Section 3.07. Optional Redemption.

                  (a) The Company may redeem any or all of the Notes at any time
on or after December 15, 2006 at the redemption prices set forth in paragraph 5
of the Note attached hereto.

                  (b) Following the Acquisition Closing Date, from time to time,
on or prior to December 15, 2005, the Company may, at its option, use the net
cash proceeds of one or more Equity Offerings to redeem up to 35% of the
aggregate principal amount of the Notes issued under this Indenture at a
redemption price of 109% of the principal amount thereof, plus accrued and
unpaid interest thereon, if any, and Liquidated Damages, if any, to the date of
redemption; provided that (i) at least 65% of the original principal amount of
the Notes issued under this Indenture shall remain outstanding immediately after
each such redemption, and (ii) the Company shall make such redemption not more
than 90 days after the consummation of any such Equity Offering.

                  (c) Any redemption pursuant to this Section 3.07 shall be made
pursuant to the provisions of Sections 3.01 through 3.06 hereof.

Section 3.08. Repurchase at the Option of Holders.

                  In the event that, pursuant to Section 4.15 or Section 4.16
hereof, the Company shall be required to commence an offer to all Holders to
purchase Notes (a "Repurchase Offer"), and they shall follow the procedures
specified below.

                  The Repurchase Offer shall remain open for a period of 20
Business Days following its commencement and no longer, except to the extent
that a longer period is required by applicable law (the "Offer Period"). No
later than five Business Days after the termination of the Offer Period (the
"Purchase Date"), the Company shall purchase at the purchase price (as
determined in accordance with Section 4.15 hereof), the principal amount of
Notes

                                      -44-
<PAGE>

required to be purchased pursuant to Section 4.15 hereof, in the aggregate (the
"Offer Amount") or, if less than the Offer Amount has been tendered, all Notes
tendered in response to such Repurchase Offer. Payment for any Notes so
purchased shall be made in the same manner as interest payments are made.

                  If the Purchase Date is on or after an interest record date
and on or before the related interest payment date, any accrued and unpaid
interest shall be paid to the person in whose name a Note is registered at the
close of business on such record date, and no additional interest shall be
payable to Holders who tender Notes pursuant to such Repurchase Offer.

                  Upon the commencement of a Repurchase Offer, the Company shall
send, by first class mail, a notice to the Trustee and each of the Holders, with
a copy to the Trustee. The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to such Repurchase
Offer. The Repurchase Offer shall be made to all Holders. The notice, which
shall govern the terms of such Repurchase Offer, shall state:

                  (a) that the Repurchase Offer is being made pursuant to this
         Section 3.08 and Section 4.15 or Section 4.16, as the case may be,
         hereof, and the length of time the Repurchase Offer shall remain open;

                  (b) the Offer Amount, the purchase price and the Purchase
         Date;

                  (c) that any Note not tendered or accepted for payment shall
         continue to accrue interest;

                  (d) that, unless the Company default in making such payment,
         any Note accepted for payment pursuant to the Repurchase Offer shall
         cease to accrue interest after the Purchase Date;

                  (e) that Holders electing to have a Note purchased pursuant to
         any Repurchase Offer may elect to have Notes purchased in integral
         multiples of $1,000 only;

                  (f) that Holders electing to have a Note purchased pursuant to
         any Repurchase Offer shall be required to surrender the Note, with the
         form entitled "Option of Holder to Elect Purchase" on the reverse of
         the Note completed, or transfer by book-entry transfer, to the Company,
         a Depositary, if appointed by the Company, or a Paying Agent at the
         address specified in the notice before the Purchase Date;

                  (g) that Holders shall be entitled to withdraw their election
         if the Company, the Depositary or the Paying Agent, as the case may be,
         receives, not later than the expiration of the Offer Period, a
         telegram, telex, facsimile transmission or letter setting forth the
         name of the Holder, the principal amount of the Notes the Holder
         delivered

                                      -45-
<PAGE>

         for purchase and a statement that such Holder is withdrawing his
         election to have such Notes purchased; and

                  (h) that, if the aggregate principal amount of Notes
         surrendered by Holders exceeds the Offer Amount, the Notes shall be
         selected for purchase pursuant to the terms of this Section 3.08, and
         that Holders whose Notes were purchased only in part shall be issued
         new Notes equal in principal amount to the unpurchased portion of the
         Notes surrendered (or transferred by book-entry transfer).

                  On or before the Purchase Date, the Company shall, to the
extent lawful, accept for payment, pursuant to the terms of this Section 3.08,
the Offer Amount of Notes or portions thereof tendered pursuant to the
Repurchase Offer, or if less than the Offer Amount has been tendered, all Notes
tendered, and shall deliver to the Trustee an Officers' Certificate stating that
such Notes or portions thereof were accepted for payment by the Company in
accordance with the terms of this Section 3.08. The Company, the Depositary or
the Paying Agent, as the case may be, shall promptly (but in any case not later
than five Business days after the Purchase Date) mail or deliver to each
tendering Holder an amount equal to the purchase price of the Notes tendered by
such Holder and accepted by the Company for purchase, and the Company shall
promptly issue a new Note, and the Trustee, upon receipt of an Authentication
Order in accordance with Section 2.02 with respect to such Note, shall
authenticate and mail or deliver such new Note to such Holder, in a principal
amount equal to any unpurchased portion of the Note surrendered. Any Note not so
accepted shall be promptly mailed or delivered by the Company to the Holder
thereof. The Company shall publicly announce through PR Newswire, Dow
Businesswire or any comparable wire service that distributes releases to the
broad financial and investor media, the results of the Repurchase Offer on the
Purchase Date.

                  The Company shall comply with the requirements of Rule 14e-1
under the Exchange Act, and any other securities laws and regulations thereunder
to the extent that such laws or regulations are applicable in connection with
the repurchase of the Notes pursuant to the Repurchase Offer. To the extent that
the provisions of Rule 14e-1 under the Exchange Act or any securities laws or
regulations conflict with the provisions of this Section 3.08 or with Section
4.15 hereof, the Company will comply with the applicable securities laws and
regulations and will not be deemed to have breached its obligations under those
sections of this Indenture.

                  Any redemption pursuant to Article 3 hereof shall be subject
to the provisions of Section 2.01. Notes called for redemption become due and
payable on the date fixed for redemption. Interest will cease to accrue on the
Notes or portions thereof being redeemed on and after the redemption date,
unless the Company defaults in the payment of the redemption or repurchase
price.

                                      -46-
<PAGE>

Section 3.09. Special Mandatory Redemption.

                  In the event that, pursuant to paragraph 7 of the Note
attached hereto, the Company shall be required to redeem (the "Special Mandatory
Redemption") all of the outstanding Notes, such Special Mandatory Redemption
shall be made pursuant to the provisions of the Escrow Agreement.

                                   ARTICLE 4.

                                    COVENANTS

Section 4.01. Payment of Notes.

                  (a) The Company shall pay or cause to be paid the principal
of, premium, if any, Liquidated Damages, if any, and interest on the Notes on
the dates and in the manner provided in the Notes. Principal, premium, if any,
Liquidated Damages, if any, and interest shall be considered paid on the date
due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m. Eastern Time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, and interest then due. The Company shall pay all
Liquidated Damages, if any, in the same manner on the dates and in the amounts
set forth in the Registration Rights Agreement.

                  (b) The Company shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue principal and
premium, if any, at the rate equal to 1% per annum in excess of the then
applicable interest rate on the Notes to the extent lawful; it shall pay
interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue installments of interest and Liquidated Damages
(without regard to any applicable grace period) at the same rate to the extent
lawful.

Section 4.02. Maintenance of Office or Agency.

                  (a) The Company shall maintain in the Borough of Manhattan,
The City of New York, an office or agency (which may be an office of the Trustee
or an affiliate of the Trustee, Registrar or co-registrar) where Notes may be
surrendered for payment, registration of transfer or for exchange and where
notices and demands to or upon the Company in respect of the Notes and this
Indenture may be served. The Company shall give prompt written notice to the
Trustee of the location, and any change in the location, of such office or
agency. If at any time the Company shall fail to maintain any such required
office or agency or shall fail to furnish the Trustee with the address thereof,
such presentations, surrenders, notices and demands may be made or served at the
Corporate Trust Office of the Trustee.

                  (b) The Company may also from time to time designate one or
more other offices or agencies where the Notes may be presented or surrendered
for any or all such

                                      -47-
<PAGE>

purposes and may from time to time rescind such designations; provided, however,
that no such designation or rescission shall in any manner relieve the Company
of its obligation to maintain an office or agency in the Borough of Manhattan,
The City of New York for such purposes. The Company shall give prompt written
notice to the Trustee of any such designation or rescission and of any change in
the location of any such other office or agency.

                  (c) The Company hereby designates the Trustee's office at 55
Water Street, Ground Level, New York, New York 10041 as one such office or
agency of the Company in accordance with Section 2.03.

Section 4.03. Reports.

                  (a) Whether or not the Company is required to do so by the
rules and regulations of the Commission, so long as any Notes are outstanding,
the Company will file with the Commission all reports, statements and other
information as the Company would be required to file with the Commission by
Section 13(a) or 15(d) of the Exchange Act. The Company shall deliver to the
Trustee and furnish each Holder, without cost to such Holder, copies of such
reports and other information.

                  (b) For so long as any Notes remain outstanding, the Company
shall furnish to the Holders and to securities analysts and prospective
purchasers of Notes, upon their request, the information required to be
delivered pursuant to Rule 144A(d)(4) under the Securities Act.

                  (c) After the Exchange Offer or the effectiveness of the Shelf
Registration Statement, whether or not required by the rules and regulations of
the Commission, the Company shall file a copy of all of the information and
reports required to be delivered pursuant to clause (a) of this Section 4.03
with the Commission for public availability, unless the Commission shall not
accept such a filing, and from and after the date hereof will make this
information available to securities analysts and prospective investors upon
request. In addition, for so long as any Notes remain outstanding, the Company
shall file with the Trustee and the Commission (unless the Commission shall not
accept such filing) the information required to be delivered pursuant to clause
(a) of this Section 4.03 within the time periods specified in the Commission's
rules and regulations and furnish that information to Holders of the Notes,
securities analysts and prospective investors upon their request.

                  (d) In the event that the Commission will not accept those
reports for filing, the Company shall nonetheless furnish to the Holders of the
Notes within the same time period: (1) all quarterly and annual financial
information that would be required to be contained in a filing with the
Commission on Forms 10-Q and 10-K if the Company were required to file such
forms, including a "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and, with respect to the annual information only, a
report on the annual financial statements by the Company's certified independent
accountants;

                                      -48-
<PAGE>

and (2) all current reports that would be required to be filed with the
Commission on Form 8-K if the Company were required to file such reports.

                  (e) If the Company has designated any Subsidiaries as
Unrestricted Subsidiaries, then the quarterly and annual financial information
required by this Section 4.03 shall include a reasonably detailed presentation,
either on the face of the financial statements or in the footnotes thereto, and
in the Management's Discussion and Analysis of Financial Condition and Results
of Operations, of the financial condition and results of operation of the
Company and its Restricted Subsidiaries separate from the financial condition
and results of operations of the Unrestricted Subsidiaries, if materially
different.

Section 4.04. Compliance Certificate.

                  (a) The Company shall deliver to the Trustee, within 90 days
after the end of each fiscal year, an Officers' Certificate stating that a
review of the activities of the Company and its Restricted Subsidiaries during
the preceding fiscal year has been made under the supervision of the signing
Officers with a view to determining whether each of the Company and its
Restricted Subsidiaries has kept, observed, performed and fulfilled its
obligations under this Indenture, and further stating, as to each such Officer
signing such certificate, that to the best of his or her knowledge the Company
has kept, observed, performed and fulfilled each and every covenant contained in
this Indenture and is not in default in the performance or observance of any of
the terms, provisions and conditions of this Indenture (or, if a Default or
Event of Default shall have occurred, describing all such Defaults or Events of
Default of which he or she may have knowledge and what action the Company is
taking or proposes to take with respect thereto) and that to the best of his or
her knowledge no event has occurred and remains in existence by reason of which
payments on account of the principal of or interest, if any, on the Notes is
prohibited or if such event has occurred, a description of the event and what
action the Company is taking or proposes to take with respect thereto.

                  (b) So long as not contrary to the then current
recommendations of the American Institute of Certified Public Accountants, the
year-end financial statements delivered pursuant to Section 4.03(a) above shall
be accompanied by a written statement of the Company's independent public
accountants (who shall be a firm of established national reputation) that in
making the examination necessary for certification of such financial statements,
nothing has come to their attention that would lead them to believe that the
Company has violated any provisions of Article 4 or Article 5 hereof or, if any
such violation has occurred, specifying the nature and period of existence
thereof, it being understood that such accountants shall not be liable directly
or indirectly to any person for any failure to obtain knowledge of any such
violation.

                  (c) The Company shall, so long as any of the Notes are
outstanding, deliver to the Trustee, forthwith upon any Officer becoming aware
of any Default or Event of Default,

                                      -49-
<PAGE>

an Officers' Certificate specifying such Default or Event of Default and what
action the Company is taking or proposes to take with respect thereto.

Section 4.05. Taxes.

                  The Company shall pay, and shall cause each of its
Subsidiaries to pay, prior to delinquency, all material taxes, assessments, and
governmental levies except such as are contested in good faith and by
appropriate proceedings or where the failure to effect such payment is not
adverse in any material respect to the Holders of the Notes.

Section 4.06. Stay, Extension and Usury Laws.

                  The Company covenants (to the extent that it may lawfully do
so) that it shall not at any time insist upon, plead, or in any manner
whatsoever claim or take the benefit or advantage of, any stay, extension or
usury law wherever enacted, now or at any time hereafter in force, that may
affect the covenants or the performance of this Indenture; and the Company (to
the extent that it may lawfully do so) hereby expressly waives all benefit or
advantage of any such law, and covenants that it shall not, by resort to any
such law, hinder, delay or impede the execution of any power herein granted to
the Trustee, but shall suffer and permit the execution of every such power as
though no such law has been enacted.

Section 4.07. Restricted Payments.

                  (a) Prior to the Acquisition Closing Date, the Company shall
not make any Restricted Payment or any Permitted Investment except to the extent
necessary to consummate the Acquisition, the Grant Prideco Assumption and the
transactions contemplated thereby, including any Investments deemed to exist by
virtue of the Escrow Agreement.

                  (b) From and after the Acquisition Closing Date, the Company
shall not, and shall not permit any of its Restricted Subsidiaries to, directly
or indirectly:

                  (i) declare or pay any dividend or make any other payment or
         distribution on account of the Company's or any of its Restricted
         Subsidiaries' Equity Interests, including, without limitation, any
         payment in connection with any merger or consolidation involving the
         Company or any of its Restricted Subsidiaries, or to the direct or
         indirect holders of the Company or any of its Restricted Subsidiaries'
         Equity Interests in their capacity as such, except for dividends or
         distributions that are payable in the Company's Equity Interests (other
         than Disqualified Stock) or payable to the Company or any of its
         Restricted Subsidiaries;

                  (ii) purchase, redeem or otherwise acquire or retire for
         value, including, without limitation, in connection with any merger or
         consolidation involving the Company, any of the Company's Equity
         Interests;

                                      -50-
<PAGE>

                  (iii) make any payment on or with respect to, or purchase,
         redeem, defease or otherwise acquire or retire for value any
         Indebtedness that is subordinated to the Notes or the Subsidiary
         Guarantees, except a payment of interest or principal at the Stated
         Maturity thereof; or

                  (iv) make any Restricted Investment;

all such payments and other actions set forth in these clauses (i) through (iv)
above being collectively referred to as "Restricted Payments."

                  (c) Notwithstanding clause (b) of this Section 4.07, the
         Company shall be permitted to engage in, and to cause or allow any of
         its Restricted Subsidiaries to engage in, a Restricted Payment, so long
         as, at the time of and after giving effect to such Restricted Payment:

                           (i) no Default or Event of Default has occurred and
                  is continuing or would occur as a consequence of such
                  Restricted Payment; and

                           (ii) the Company would, at the time of such
                  Restricted Payment and after giving pro forma effect thereto
                  as if such Restricted Payment had been made at the beginning
                  of the applicable four-quarter period, have been permitted to
                  incur at least $1.00 of additional Indebtedness pursuant to
                  the Fixed Charge Coverage Ratio test set forth in clause (b)
                  of Section 4.09; and

                           (iii) the aggregate amount of that Restricted Payment
                  and all other Restricted Payments made by the Company and its
                  Restricted Subsidiaries after December 4, 2000, excluding
                  Restricted Payments permitted by clauses (ii), (iii), (iv),
                  (vi) and (vii) of Section 4.07(d), is less than or equal to
                  the sum, without duplication, of:

                                    (A) 50% of the Company's Consolidated Net
                           Income for the period (taken as one accounting
                           period) from October 1, 2000 to the end of the
                           Company's most recently ended fiscal quarter for
                           which the Company has filed financial statements with
                           the Commission (or, if such Consolidated Net Income
                           for such period is a deficit, less 100% of such
                           deficit), plus

                                    (B) 100% of the aggregate net cash proceeds
                           received by the Company since December 4, 2000 as a
                           contribution to the Company's common equity capital
                           or from the issue or sale (other than to a
                           Subsidiary) of the Company's or any of its Restricted
                           Subsidiaries' Equity Interests (other than
                           Disqualified Stock) or from the issue or sale (other
                           than to a Subsidiary) of the Company's convertible or
                           exchangeable Disqualified Stock or the Company's
                           convertible or exchangeable debt

                                      -51-
<PAGE>

                           securities that have been converted into or exchanged
                           for Equity Interests (other than Disqualified Stock),
                           plus

                                    (C) to the extent that any Restricted
                           Investment that the Company or any of its Restricted
                           Subsidiaries makes after December 4, 2000 is sold for
                           cash or otherwise liquidated or repaid for cash, an
                           amount equal to the lesser of (1) the cash return of
                           capital with respect to any such Restricted
                           Investment (less the cost of disposition, if any) and
                           (2) the initial amount of such Restricted Investment,
                           plus

                                    (D) if the Company redesignates any
                           Unrestricted Subsidiary as a Restricted Subsidiary
                           after December 4, 2000, an amount equal to the lesser
                           of (1) the net book value of the Company's Investment
                           in the Unrestricted Subsidiary at the time the
                           Unrestricted Subsidiary was designated as such and
                           (2) the fair market value of the Company's Investment
                           in the Unrestricted Subsidiary at the time of the
                           redesignation.

                  (d) Notwithstanding clauses (b) and (c) of this Section 4.07,
         the Company shall be permitted to effect, and to cause or allow any of
         its Restricted Subsidiaries to effect:

                           (i) the payment of any dividend within 60 days after
                  the date of declaration of the dividend, if at the date of
                  declaration the dividend payment would have complied with the
                  provisions of this Indenture;

                           (ii) the redemption, repurchase, retirement,
                  defeasance or other acquisition of any of (a) the Company's
                  Indebtedness or any Indebtedness of any Guarantor that is
                  subordinated to the Notes or the Subsidiary Guarantees, or (b)
                  the Company's Equity Interests or any Equity Interests of any
                  of the Company's Restricted Subsidiaries, in either case in
                  exchange for, or out of the net cash proceeds of the
                  substantially concurrent sale (other than to one of the
                  Company's Subsidiaries) of, the Company's Equity Interests
                  (other than Disqualified Stock); provided, however, that the
                  amount of any such net cash proceeds that are utilized for any
                  such redemption, repurchase, retirement, defeasance or other
                  acquisition will be excluded from clause (c)(iii)(B) of this
                  Section 4.07;

                           (iii) the defeasance, redemption, repurchase or other
                  acquisition of the Company's Indebtedness or Indebtedness of
                  any Guarantor that is subordinated to the Notes or the
                  Subsidiary Guarantees with the net cash proceeds from an
                  incurrence of Permitted Refinancing Indebtedness;

                                      -52-
<PAGE>

                           (iv) the payment of any dividend by one of the
                  Company's Restricted Subsidiaries to the holders of that
                  Restricted Subsidiary's common Equity Interests on a pro rata
                  basis, so long as the Company or one of its Restricted
                  Subsidiaries receives at least a pro rata share (and in like
                  form) of the dividend or distribution in accordance with its
                  common Equity Interests;

                           (v) the repurchase, redemption or other acquisition
                  or retirement for value of any of the Company's or any of its
                  Restricted Subsidiaries' Equity Interests held by any member
                  of the Company's or any of its Restricted Subsidiaries'
                  management pursuant to any management equity subscription
                  agreement, stock option agreement or similar agreement,
                  provided, however, that the aggregate price paid for all such
                  repurchased, redeemed, acquired or retired Equity Interests
                  may not exceed $1.0 million in any twelve-month period;

                           (vi) in connection with an acquisition by the Company
                  or any of its Restricted Subsidiaries, the return to the
                  Company or such Restricted Subsidiary of Equity Interests of
                  the Company or such Restricted Subsidiary constituting a
                  portion of the purchase consideration in settlement of
                  indemnification claims;

                           (vii) the purchase by the Company of fractional
                  shares arising out of stock dividends, splits or combinations
                  or business combinations;

                           (viii) the acquisition in open-market purchases of
                  the Company's common Equity Interests for matching
                  contributions to the Company's employee stock purchase and
                  deferred compensation plans in the ordinary course of business
                  and consistent with past practices; or

                           (ix) other Restricted Payments in an aggregate amount
                  since December 4, 2000 not to exceed $10.0 million,

         provided, however, that, with respect to clauses (ii), (iii), (v),
         (viii) and (ix) above, no Default or Event of Default shall have
         occurred and be continuing immediately after such transaction.

                  (e) The amount of all Restricted Payments (other than cash)
         will be the fair market value on the date of the Restricted Payment of
         the asset(s) or securities proposed to be transferred or issued by the
         Company or a Restricted Subsidiary, as the case may be, pursuant to the
         Restricted Payment. The fair market value of any assets or securities
         that are required to be valued by this Section 4.07 will be determined
         by the Company's Board of Directors whose resolution with respect
         thereto will be delivered to the Trustee. The Board of Directors'
         determination must be based upon an opinion or appraisal issued by an
         accounting, appraisal or investment banking firm of

                                      -53-
<PAGE>

         national standing if the fair market value exceeds $10.0 million. Not
         later than the date of making any Restricted Payment, the Company shall
         deliver to the Trustee an Officers' Certificate stating that such
         Restricted Payment is permitted and setting forth the basis upon which
         the calculations required by this Section 4.07 were computed, together
         with a copy of any fairness opinion or appraisal required by this
         Indenture.

Section 4.08. Dividend and Other Payment Restrictions Affecting Subsidiaries.

                  (a) From and after the Acquisition Closing Date, the Company
shall not, and shall not permit any of its Restricted Subsidiaries to, directly
or indirectly, create or permit to exist or become effective any consensual
encumbrance or restriction on the ability of any Restricted Subsidiary of the
Company to (i)(A) pay dividends or make any other distributions on any Capital
Stock of such Restricted Subsidiary to the Company or any other Restricted
Subsidiary, or with respect to any other interest or participation in, or
measured by, the profits of such Restricted Subsidiary, or (B) pay any
Indebtedness owed to the Company or any other Restricted Subsidiary, (ii) make
loans or advances to the Company or any other Restricted Subsidiary, or (iii)
transfer any of its properties or assets to the Company or any other Restricted
Subsidiary.

                  (b) The provisions of Section 4.08(a) above shall not apply to
encumbrances or restrictions existing under or by reason of:

                  (i) agreements governing Existing Indebtedness, or any Credit
         Facilities, as in effect on the Acquisition Closing Date and any
         amendments, modifications, restatements, renewals, increases,
         supplements, refundings, replacements or refinancings of those
         agreements, provided that the amendments, modifications, restatements,
         renewals, increases, supplements, refundings, replacement or
         refinancings of any of the foregoing are no more restrictive, taken as
         a whole, with respect to such dividend and other payment restrictions
         than those contained in those agreements on the date hereof;

                  (ii) this Indenture, the Notes and the Subsidiary Guarantees,
         or any other indenture governing debt securities that are no more
         restrictive, taken as a whole, with respect to dividend and other
         payment restrictions than those contained in this Indenture and the
         Notes;

                  (iii) applicable law or any applicable rule, regulation or
         order;

                  (iv) any instrument governing Indebtedness or Capital Stock of
         a person acquired by the Company or any of its Restricted Subsidiaries
         as in effect at the time of such acquisition (except to the extent such
         Indebtedness or Capital Stock was incurred in connection with or in
         contemplation of such acquisition), which encumbrance or restriction is
         not applicable to any person, or the properties or assets of any
         person, other than the person, or the property or assets of the person,
         so acquired, provided that, in

                                      -54-
<PAGE>

         the case of Indebtedness, such Indebtedness was permitted by the terms
         of this Indenture to be incurred;

                  (v) customary non-assignment provisions in leases entered into
         in the ordinary course of business and consistent with past practices;

                  (vi) purchase money obligations for property acquired in the
         ordinary course of business that impose restrictions on that property
         of the nature described in clause (a)(iii) of this Section 4.08;

                  (vii) any agreement (A) for the sale or other disposition of
         all of the Equity Interests in or all or substantially all of the
         assets of one of the Company's Restricted Subsidiaries that restricts
         distributions or asset transfers by that Restricted Subsidiary pending
         that sale or other disposition or (B) for the sale of a particular
         asset or line of business of a Restricted Subsidiary that imposes
         restrictions on the property subject to an agreement of the nature
         described in clause (a)(iii) of this Section 4.08; or

                  (viii) Permitted Refinancing Indebtedness, provided that any
         restrictions contained in the agreements governing such Permitted
         Refinancing Indebtedness are not materially more restrictive, taken as
         a whole, than those contained in the agreements governing the
         Indebtedness being refinanced and that such Permitted Refinancing
         Indebtedness was permitted to be incurred under Section 4.09 hereof;

                  (ix) Liens securing Indebtedness otherwise permitted to be
         incurred under the provisions of Section 4.11 that limit the right of
         the debtor to dispose of the assets subject to such Liens; and

                  (x) provisions with respect to the disposition of specific
         assets or property in asset sale agreements entered into in the
         ordinary course of business.

Section 4.09. Incurrence of Indebtedness and Issuance of Preferred Stock.

                  (a) Prior to the Acquisition Closing Date, the Company shall
not incur any Indebtedness except the following:

                  (1)      the Notes in an aggregate principal amount not to
                           exceed $175.0 million; and

                  (2)      Indebtedness that is not secured by a Lien on any
                           assets, property or Capital Stock owned by the
                           Company or any of the Company's Subsidiaries, the
                           proceeds of which Indebtedness are used solely for
                           deposit (or the purchase of Government Securities to
                           be deposited) with the Trustee in an amount not to
                           exceed the amount necessary, together with

                                      -55-
<PAGE>

                           net proceeds to the Company from the issuance of the
                           Notes, to enable the Company to make the Initial
                           Deposit.

                  (b) From and after the Acquisition Closing Date, the Company
shall not, and shall not permit any of its Restricted Subsidiaries to, incur any
Indebtedness (including Acquired Debt), and the Company shall not issue any
Disqualified Stock, and shall not permit any of its Restricted Subsidiaries to
issue any shares of preferred stock; provided, however, that (1) the Company and
any Guarantor may incur Indebtedness (including Acquired Debt) and (b) the
Company may issue Disqualified Stock, if, in each case, the Fixed Charge
Coverage Ratio for the Company's most recently ended fiscal four full fiscal
quarters for which the Company has filed financial statements with the
Commission preceding the date on which such additional Indebtedness is incurred
or such Disqualified Stock is issued, as the case may be, would have been at
least 2.25 to 1.0, determined on a pro forma basis (including a pro forma
application of the net proceeds therefrom), as if the additional Indebtedness
had been incurred or the Disqualified Stock had been issued, as the case may be,
at the beginning of such four-quarter period.

                  (c) In addition to the foregoing, the Company and any
Restricted Subsidiary (except as specified below) may incur the following types
of Indebtedness (collectively, "Permitted Debt"):

                  (i) the incurrence by the Company or any Guarantor of
         additional Indebtedness and letters of credit under one or more Credit
         Facilities and guarantees thereof by the Guarantors; provided, however,
         that the aggregate principal amount of all Indebtedness incurred by the
         Company and the Guarantors pursuant to this clause (i) and by the
         Foreign Restricted Subsidiaries pursuant to clause (viii) below (with
         letters of credit being deemed to have a principal amount equal to the
         maximum potential liability of the Company and its Restricted
         Subsidiaries thereunder) outstanding at any one time does not exceed
         $190.0 million;

                  (ii) the incurrence by the Company and the Restricted
         Subsidiaries of the Existing Indebtedness;

                  (iii) the incurrence by the Company of Indebtedness
         represented by the Notes issued on the Issue Date and the incurrence by
         the Guarantors of the Subsidiary Guarantees of those Notes;

                  (iv) the incurrence by the Company, or by any Restricted
         Subsidiary that is a Guarantor, of Indebtedness represented by Capital
         Lease Obligations, mortgage financings or purchase money obligations,
         in each case incurred for the purpose of financing all or any part of
         the purchase price or cost of construction or improvement of property,
         plant or equipment used in the Company's business or the business of
         that Restricted Subsidiary, in an aggregate principal amount not to
         exceed $10.0 million at any time outstanding;

                                      -56-
<PAGE>

                  (v) the incurrence by the Company or any of its Restricted
         Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or
         the net proceeds of which are used to refund, refinance or replace
         Indebtedness (other than intercompany Indebtedness) that was incurred
         under clause (b) of this Section 4.09 or clauses (ii), (iii) or (iv) of
         this Section 4.09(c); provided, however, that no Restricted Subsidiary
         that is not a Guarantor may refund, refinance or replace Indebtedness
         previously incurred by the Company or by any Restricted Subsidiary that
         is a Guarantor;

                  (vi) the incurrence by the Company or any of its Restricted
         Subsidiaries of intercompany Indebtedness between or among the Company
         and any of its Restricted Subsidiaries; provided, however, that:

                           (A) if the Company or a Guarantor is the obligor on
                  such intercompany Indebtedness, such intercompany Indebtedness
                  must be expressly subordinated to the prior payment in full in
                  cash of all Obligations with respect to, in the case of the
                  Company, the Notes, and, in the case of a Guarantor, the
                  Subsidiary Guarantees; and

                           (B) (1) any subsequent issuance or transfer of Equity
                  Interests that results in any such Indebtedness being held by
                  a person other than the Company or a Restricted Subsidiary
                  that is a Guarantor and (2) any sale or other transfer of any
                  such Indebtedness to a person that is not either the Company
                  or a Restricted Subsidiary that is a Guarantor shall be
                  deemed, in each case, to constitute an incurrence of such
                  Indebtedness by the Company or such Restricted Subsidiary, as
                  the case may be, that was not permitted by this clause (vi);

                  (vii) the incurrence by the Company or any of its Restricted
         Subsidiaries of Hedging Obligations;

                  (viii) Indebtedness of the Foreign Restricted Subsidiaries
         that are not Guarantors in an aggregate principal amount not to exceed
         $25.0 million; provided that the aggregate principal amount of all
         Indebtedness incurred by the Foreign Restricted Subsidiaries pursuant
         to this clause (viii) and by the Company and the Guarantors pursuant to
         clause (i) above (with letters of credit being deemed to have a
         principal amount equal to the maximum potential liability of the
         Company and its Restricted Subsidiaries thereunder) outstanding at any
         one time does not exceed $190.0 million;

                  (ix) the guarantee by the Company or any of the Guarantors of
         Indebtedness of the Company or of any of the Guarantors that was
         permitted to be incurred by another provision of this Section 4.09; and

                                      -57-
<PAGE>

                  (x) the incurrence by the Company or a Restricted Subsidiary
         of additional Indebtedness in an aggregate principal amount (or
         accreted value, as applicable) at any time outstanding, including all
         Permitted Refinancing Indebtedness incurred to refund, refinance or
         replace any Indebtedness incurred pursuant to this clause (x), not to
         exceed $35.0 million.

                  (d) The maximum amount of Indebtedness that the Company or a
Restricted Subsidiary may incur pursuant to this Section 4.09 shall not be
deemed to be exceeded, with respect to any outstanding Indebtedness, due solely
to fluctuations in the exchange rates of currencies.

                  (e) For purposes of determining compliance with this covenant,
in the event that an item of proposed Indebtedness, including Acquired Debt,
meets the criteria of more than one of the categories of Permitted Debt
described in clauses (c)(i) through (x) of this Section 4.09 as of the date of
incurrence thereof, or is entitled to be incurred pursuant to clause (b) of this
Section 4.09 as of the date of incurrence thereof or pursuant to any combination
of the foregoing as of the date of incurrence thereof, the Company shall, in its
sole discretion, classify (or later classify or reclassify) in whole or in part,
in the Company's sole discretion, such item of Indebtedness in any manner that
complies with this Section 4.09. Accrual of interest or dividends, the accretion
of accreted value or liquidation preference and the payment of interest or
dividends in the form of additional Indebtedness or Disqualified Stock will not
be deemed to be an incurrence of Indebtedness or an issuance of Disqualified
Stock for purposes of this Section 4.09.

Section 4.10. Transactions with Affiliates.

                  (a) Prior to the Acquisition Closing Date, the Company shall
not enter into or permit to exist any Affiliate Transactions other than to the
extent necessary to consummate the Acquisition, the Grant Prideco Assumption,
the Merger and the transactions contemplated thereby.

                  (b) From and after the Acquisition Closing Date, the Company
shall not, and shall not permit any of its Restricted Subsidiaries to, make any
payment to, or sell, lease, transfer or otherwise dispose of any properties or
assets to, or purchase any property or assets from, or enter into or make or
amend any transaction, contract, agreement, understanding, loan, advance or
guarantee with, or for the benefit of, any Affiliate (each, an "Affiliate
Transaction"), unless:

                  (i) the Affiliate Transaction is on terms that are no less
         favorable to the Company or the relevant Restricted Subsidiary than
         those that would have been obtained in a comparable transaction by the
         Company or such Restricted Subsidiary with an unrelated person; and

                                      -58-
<PAGE>

                  (ii) the Company delivers to the Trustee:

                           (A) with respect to any Affiliate Transaction or
                  series of related Affiliate Transactions involving aggregate
                  consideration in excess of $1.0 million, a resolution of the
                  Company's Board of Directors set forth in an Officers'
                  Certificate certifying that such Affiliate Transaction
                  complies with this Section 4.10 and that such Affiliate
                  Transaction has been approved by a majority of the
                  disinterested members of the Company's Board of Directors; and

                           (B) with respect to any Affiliate Transaction or
                  series of related Affiliate Transactions involving aggregate
                  consideration in excess of $5.0 million, an opinion as to the
                  fairness to the Holders of such Affiliate Transaction from a
                  financial point of view issued by an accounting, appraisal or
                  investment banking firm of national standing.

                  (c) The following items will not be deemed to be Affiliate
Transactions and, therefore, will not be subject to the provisions of clause (b)
of this Section 4.10:

                  (i) any employment agreement entered into by the Company or a
         Restricted Subsidiary in the ordinary course of business and consistent
         with the past practice of the Company or such Restricted Subsidiary;

                  (ii) transactions between or among the Company and/or its
         Restricted Subsidiaries;

                  (iii) transactions with a person that is an Affiliate of the
         Company solely because the Company owns an Equity Interest in such
         person;

                  (iv) payment of reasonable directors fees and reasonable
         indemnitees to persons who are not otherwise Affiliates of the Company;

                  (v) sales of Equity Interests (other than Disqualified Stock)
         to Affiliates of the Company;

                  (vi) transactions with Weatherford (A) pursuant to agreements
         as in effect on the Issue Date, and (B) in commercial transactions in
         the ordinary course of business on terms no less favorable to the
         Company or the relevant Restricted Subsidiary than the Company could
         obtain in an arm's length transaction with an unrelated person;

                  (vii) Restricted Payments or Permitted Investments that are
         permitted by Section 4.07

                                      -59-
<PAGE>

Section 4.11. Liens.

                  Prior to the Acquisition Closing Date, the Company shall not
create, incur, assume or suffer to exist any Lien of any kind against or upon
any of its property or assets, or any proceeds, income or profit therefrom which
secure any Indebtedness other than as contemplated by the Escrow Agreement.

                  From and after the Acquisition Closing Date, the Company shall
not, and shall not permit any of its Restricted Subsidiaries to, directly or
indirectly, create, incur, assume or suffer to exist any Lien of any kind
securing Indebtedness, Attributable Debt or trade payables, except Permitted
Liens, upon any of the Company's, or a Restricted Subsidiary's, property or
assets, now owned or acquired after the Issue Date, unless all payments due
under this Indenture and the Notes, or the Subsidiary Guarantees, as applicable,
are secured on an equal and ratable basis with (or if the obligations being
secured rank junior in right of payment to the Notes, on a senior basis to) the
obligations so secured until such time as such obligations are no longer secured
by a Lien.

Section 4.12. Additional Subsidiary Guarantees.

                  On the Acquisition Closing Date, the Company's Domestic
Subsidiaries existing prior to the Acquisition shall execute a Subsidiary
Guarantee. Any Domestic Subsidiary created or acquired in connection with the
Acquisition shall comply with this Section 4.12.

                  If the Company or any Restricted Subsidiary acquires or
creates another Domestic Subsidiary on or after the Acquisition Closing Date,
then that newly acquired or created Domestic Subsidiary will become a Guarantor
and execute a supplemental indenture and deliver an Opinion of Counsel
satisfactory to the Trustee within ten Business Days of the date on which it was
acquired or created; provided, however, that the foregoing shall not apply to
Subsidiaries that have properly been designated as Unrestricted Subsidiaries in
accordance with this Indenture for so long as they continue to constitute
Unrestricted Subsidiaries; provided further, however, that if a Subsidiary that
is not a Guarantor guarantees any of the Company's or a Guarantor's
Indebtedness, that Subsidiary will be required to provide the Company with a
guarantee that ranks pari passu with (or, if that Indebtedness is subordinated
Indebtedness, prior to) that Indebtedness.

Section 4.13. Designation of Restricted and Unrestricted Subsidiaries.

                  From and after the Acquisition Closing Date:

                  (a) The Board of Directors of the Company may designate any
         Restricted Subsidiary (or any person that upon its acquisition
         otherwise would become a Restricted Subsidiary) to be an Unrestricted
         Subsidiary if that designation would not cause a Default. If a
         Restricted Subsidiary is designated as an Unrestricted Subsidiary, the
         aggregate fair market value of all outstanding Investments owned by the
         Company

                                      -60-
<PAGE>

         and the Restricted Subsidiaries in the Subsidiary properly designated
         will be deemed to be an Investment made as of the time of the
         designation and will reduce the amount available for Restricted
         Payments under Section 4.07(b) or Permitted Investments, as determined
         by the Company. That designation will only be permitted if the
         Investment would be permitted at that time and if the Restricted
         Subsidiary otherwise meets the definition of an Unrestricted
         Subsidiary. The Board of Directors of the Company may redesignate any
         Unrestricted Subsidiary to be a Restricted Subsidiary if the
         redesignation would not cause a Default.

                  (b) Any designation of any of the Company's Subsidiaries as an
         Unrestricted Subsidiary pursuant to this Section 4.13 shall be
         evidenced to the Trustee by filing with the Trustee a certified copy of
         the Board Resolution giving effect to such designation and an Officers'
         Certificate certifying that such designation complied with the
         preceding conditions and was permitted by Section 4.07. If, at any
         time, any Unrestricted Subsidiary would fail to meet the preceding
         requirements as an Unrestricted Subsidiary, it shall thereafter cease
         to be an Unrestricted Subsidiary for purposes of this Indenture and any
         Indebtedness of such Subsidiary shall be deemed to be incurred by a
         Restricted Subsidiary as of such date and, if such Indebtedness is not
         permitted to be incurred as of such date under Section 4.09, the
         Company shall be in default of such Section 4.09. The Company's Board
         of Directors may at any time designate any Unrestricted Subsidiary to
         be a Restricted Subsidiary; provided that such designation will be
         deemed to be an incurrence of Indebtedness by a Restricted Subsidiary
         of any outstanding Indebtedness of such Unrestricted Subsidiary and
         such designation will only be permitted if (1) such Indebtedness is
         permitted under Section 4.09 calculated on a pro forma basis as if such
         designation had occurred at the beginning of the four-quarter reference
         period; and (2) no Default or Event of Default would be in existence
         following such designation.

Section 4.14. Corporate Existence.

                  Subject to Article 5 hereof, the Company shall do or cause to
be done all things necessary to preserve and keep in full force and effect (i)
its corporate existence, and the corporate, partnership or other existence of
each of its Restricted Subsidiaries, in accordance with the respective
organizational documents (as the same may be amended from time to time) of the
Company or any such Restricted Subsidiary and (ii) the rights (charter and
statutory), licenses and franchises of the Company and its Restricted
Subsidiaries; provided, however, that the Company shall not be required to
preserve any such right, license or franchise, or the corporate, partnership or
other existence of any of its Restricted Subsidiaries, if the Board of Directors
shall determine that the preservation thereof is no longer desirable in the
conduct of the business of the Company and its Restricted Subsidiaries, taken as
a whole, and that the loss thereof is not adverse in any material respect to the
Holders of the Notes.

                                      -61-
<PAGE>

Section 4.15. Asset Sales.

                  (a) Prior to the Acquisition Closing Date, the Company shall
not consummate an Asset Sale except to the extent necessary to consummate the
Acquisition and the transactions contemplated by the Escrow Agreement including
the Grant Prideco Assumption and the related release to Grant Prideco, Inc. of
the Escrowed Property.

                  (b) From and after the Acquisition Closing Date, the Company
shall not, and shall not permit any of its Restricted Subsidiaries to,
consummate an Asset Sale unless:

                  (i) the Company, or the Restricted Subsidiary, as the case may
         be, receives consideration at the time of the Asset Sale at least equal
         to the fair market value of the assets or Equity Interests issued or
         sold or otherwise disposed of;

                  (ii) in the case of Asset Sales for consideration exceeding
         $5.0 million, the fair market value is determined by the Company's
         Board of Directors and evidenced by a resolution of the Company's Board
         of Directors set forth in an officer's certificate delivered to the
         Trustee; and

                  (iii) at least 75% of the consideration received in the Asset
         Sale by the Company or such Subsidiary is in the form of cash. For
         purposes of this provision, each of the following will be deemed to be
         cash:

                           (A) any secured Indebtedness of the Company or a
                  Guarantor and any Indebtedness of a Restricted Subsidiary that
                  is not a Guarantor that are assumed by the transferee of any
                  such assets pursuant to a customary novation agreement that
                  releases the Company or such Restricted Subsidiary from
                  further liability; and

                           (B) any securities, notes or other obligations
                  received by the Company or any Restricted Subsidiary from such
                  transferee that the Company or such Restricted Subsidiary
                  contemporaneously, subject to ordinary settlement periods,
                  converts into cash, to the extent of the cash received, in
                  that conversion.

                  (c) Within 365 days after the receipt of any Net Proceeds from
an Asset Sale, the Company may apply those Net Proceeds at its option:

                  (i) to permanently repay any secured Indebtedness of the
         Company or a Guarantor, or any Indebtedness of a Restricted Subsidiary
         that is not a Guarantor and, if any Indebtedness repaid under this
         clause (i) is revolving credit Indebtedness, to correspondingly reduce
         commitments with respect thereto; provided, however, that for purposes
         of this clause (i) only, Indebtedness shall include accrued but unpaid
         interest thereon;

                                      -62-
<PAGE>

                  (ii) to acquire all or substantially all of the assets of, or
         a majority of the Voting Stock of, another Permitted Business;

                  (iii) to make a capital expenditure; or

                  (iv) to acquire other long-term assets that are used or useful
         in a Permitted Business.

Pending the final application of any Net Proceeds, the Company may temporarily
reduce revolving credit borrowings or otherwise invest the Net Proceeds in any
manner that is not prohibited by this Indenture.

                  (d) Any Net Proceeds from Asset Sales that are not applied or
invested as provided in the preceding paragraph shall constitute "Excess
Proceeds." When the aggregate amount of Excess Proceeds exceeds $10.0 million,
the Company shall make a pro rata offer to purchase (an "Asset Sale Offer") to
all Holders of Notes and all holders of other Indebtedness that is pari passu
with the Notes containing provisions similar to those set forth in this
Indenture with respect to offers to purchase or redeem with the proceeds of
sales of assets to purchase the maximum principal amount of Notes and such other
pari passu Indebtedness that may be purchased out of the Excess Proceeds. The
offer price in any Asset Sale Offer will be equal to 100% of principal amount
plus accrued and unpaid interest to the date of purchase, and will be payable in
cash. If any Excess Proceeds remain after consummation of an Asset Sale Offer,
the Company may use those Excess Proceeds for any purpose not otherwise
prohibited by this Indenture. If the aggregate principal amount of Notes and
other pari passu Indebtedness tendered into such Asset Sale Offer exceeds the
amount of Excess Proceeds, the Trustee shall select the Notes and such other
pari passu Indebtedness to be purchased on a pro rata basis (based upon the
aggregate principal amount of the Notes and such other pari passu Indebtedness
tendered). Upon completion of each Asset Sale Offer, the amount of Excess
Proceeds will be deemed to have been reset at zero.

                  (e) The Company shall comply with the requirements of Rule
14e-1 under the Exchange Act and any other securities laws and regulations
thereunder to the extent those laws and regulations are applicable in connection
with repurchases of Notes pursuant to an Asset Sale Offer. To the extent that
the provisions of any securities laws or regulations conflict with this Section
4.15, the Company shall comply with the applicable securities laws and
regulations and will not be deemed to have breached its obligations under this
Section 4.15 by virtue of that conflict.

Section 4.16. Offer to Repurchase Upon Change of Control.

                  (a) Upon the occurrence of a Change of Control Triggering
Event, each Holder shall have the right to require the Company to make an offer
(a "Change of Control Offer") to each Holder to repurchase all or any part,
equal to $1,000 or an integral multiple of

                                      -63-
<PAGE>

$1,000, of such Holder's Notes at an offer price in cash equal to 101% of the
aggregate principal amount of Notes repurchased, plus accrued and unpaid
interest and Liquidated Damages, if any, on Notes repurchased to the date fixed
for repurchase (the "Change of Control Payment").

                  (b) Within 15 Business Days following a Change of Control
Triggering Event, the Company shall mail a notice to each Holder describing the
transaction or transactions that constitute the Change of Control Triggering
Event and offering to repurchase the Notes on the date specified in the notice,
which date shall be no earlier than 30 days and no later than 60 days from the
date the notice is mailed (the "Change of Control Payment Date") pursuant to the
procedures set forth in Section 3.08 and described in the notice. The Company
shall comply with the requirements of Rule 14e-1 under the Exchange Act and any
other securities laws and regulations thereunder to the extent those laws and
regulations are applicable to the repurchase of the Notes as a result of a
Change of Control Triggering Event. To the extent that the provisions of any
securities laws or regulations conflict with this Section 4.16, the Company
shall comply with the applicable securities laws and regulations and will not be
deemed to have breached its obligations under this Section 4.16 by virtue of
such conflict.

                  (c) On the Change of Control Payment Date, the Company shall,
to the extent lawful, (i) accept for payment all Notes or portions of Notes
properly tendered under the Change of Control Offer; (ii) deposit with the
Paying Agent an amount equal to the Change of Control Payment in respect of all
Notes or portions of the Notes properly tendered; and (iii) deliver or cause to
be delivered to the Trustee the Notes so accepted together with an Officers'
Certificate stating the aggregate principal amount of Notes or portions of the
Notes being purchased by the Company.

                  (d) The Paying Agent shall deliver promptly to each Holder of
Notes properly tendered the Change of Control Payment for such Notes, and, upon
receipt of an Authentication Order in accordance with Section 2.02 with respect
to such Notes, the Trustee shall promptly authenticate and deliver, or cause to
be transferred by book entry, to each Holder a new Note equal in principal
amount to any unpurchased portion of the Notes surrendered, if any, provided
that each new Note shall be in a principal amount of $1,000 or an integral
multiple of $1,000.

                  (e) The Change of Control provisions described in this Section
4.16 shall be applicable whether or not any other provisions of this Indenture
are applicable.

                  (f) The Company shall not be required to make a Change of
Control Offer following a Change of Control Triggering Event if a third party
makes the Change of Control Offer in the manner, at the times and otherwise in
compliance with the requirements set forth in this Section 4.16 and purchases
all Notes properly tendered and not withdrawn under the Change of Control Offer.

                                      -64-
<PAGE>

Section 4.17. Limitations on Line of Business.

                  Prior to the Acquisition Closing Date, the Company shall not
engage in any business operations other than those in connection with the
issuance of the Notes, the Escrow Agreement, the Acquisition and the Merger.

                  From and after the Acquisition Closing Date, the Company shall
not, and shall not permit any Restricted Subsidiary to, engage in any business
other than a Permitted Business, except to such extent as is not material to the
Company and its Restricted Subsidiaries, taken as a whole.

Section 4.18. Sale and Leaseback Transactions.

                  (a) Prior to the Acquisition Closing Date, the Company shall
not enter into any sale and leaseback transaction.

                  (b) From and after the Acquisition Closing Date, the Company
shall not, and shall not permit any of its Restricted Subsidiaries to, enter
into any sale and leaseback transaction; provided that the Company and its
Restricted Subsidiaries may enter into a sale and leaseback transaction if:

                  (i) the Company or the relevant Restricted Subsidiary, as the
         case may be, could have (A) incurred Indebtedness in an amount equal to
         the Attributable Debt relating to such sale and leaseback transaction
         under the Fixed Charge Coverage Ratio test in Section 4.09(b) and (B)
         incurred a Lien to secure such Indebtedness pursuant to Section 4.11;
         provided, however, that clause (A) of this clause (b)(i) shall be
         suspended during any period in which the Company and its Restricted
         Subsidiaries are not subject to the Suspended Covenants;

                  (ii) the gross cash proceeds of the sale and leaseback
         transaction are at least equal to the fair market value, as determined
         in good faith by the Company and set forth in an Officers' Certificate
         delivered to the Trustee, of the property that is the subject of the
         sale and leaseback transaction; provided, however, that in the case of
         any sale and leaseback transaction for consideration exceeding $5.0
         million, the fair market value shall be determined by the Company's
         Board of Directors and set forth in an Officers' Certificate delivered
         to the Trustee; and

                  (iii) the transfer of assets in the sale and leaseback
         transaction is permitted by, and the Company or the relevant Restricted
         Subsidiary applies the proceeds of the transaction in compliance with,
         Section 4.11 hereof; provided, however, that, in the event that the
         Company or any of its Restricted Subsidiaries consummates a sale and
         leaseback transaction during a period in which the Company is not
         subject to the Suspended Covenants, within twelve months of that sale
         and leaseback transaction, the Company shall apply the Net Cash
         Proceeds thereof to permanently repay secured

                                      -65-
<PAGE>

         Indebtedness of the Company or a Guarantor, or any Indebtedness of any
         of the Company's Restricted Subsidiaries that is not a Guarantor, and
         if any Indebtedness repaid under this clause (b)(iii) is revolving
         credit Indebtedness, to correspondingly reduce commitments with respect
         thereto.

Section 4.19. Payments for Consent.

                  Neither the Company nor any of its Restricted Subsidiaries
shall, directly or indirectly, pay or cause to be paid any consideration,
whether by way of interest, fee or otherwise, to or for the benefit of any
Holder for or as an inducement to any consent, waiver or amendment of any of the
terms or provisions of this Indenture or the Notes unless such consideration is
offered to be paid or is paid to all Holders that consent, waive or agree to
amend in the time frame set forth in the solicitation documents relating to such
consent, waiver or agreement.

Section 4.20. Suspension of Covenants.

                  During any period of time that the Notes have an Investment
Grade Rating from either of the Rating Agencies and no Default has occurred and
is continuing under this Indenture, the Company and its Restricted Subsidiaries
shall not be subject to Sections 4.07, 4.08, 4.09, 4.10, 4.15, 4.17,
4.18(b)(i)(A) and 5.01(b)(iv) (collectively, the "Suspended Covenants"),
provided, however, that if the Company and its Restricted Subsidiaries are not
subject to the Suspended Covenants for any period of time as a result of this
Section 4.20 and, subsequently, either of the Rating Agencies withdraws its
ratings or downgrades the ratings assigned to the Notes below the Investment
Grade Ratings so that the Notes do not have an Investment Grade Rating from
either Rating Agency, or a Default (other than with respect to the Suspended
Covenants) occurs and is continuing, the Company and its Restricted Subsidiaries
will thereafter again be subject to the Suspended Covenants, subject to the
terms, conditions and obligations set forth in this Indenture (each such date of
reinstatement being the "Reinstatement Date"), including this Section 4.20.
Compliance with the Suspended Covenants with respect to Restricted Payments made
after the Reinstatement Date will be calculated in accordance with Section 4.07
as though Section 4.07 had been in effect during the entire period of time from
the Issue Date.

                                   ARTICLE 5.

                                   SUCCESSORS

Section 5.01. Merger, Consolidation, or Sale of Assets.

                  (a) Except for or in connection with the Acquisition, the
Grant Prideco Assumption, the Merger and the related release of the Escrowed
Property, prior to the Acquisition Closing Date, the Company shall not, in one
or more related transactions, consolidate

                                      -66-
<PAGE>

with or merge with or into, or sell, assign, transfer, lease, convey or
otherwise dispose of all or substantially all of its assets to, another person
or persons.

                  (b) From and after the Acquisition Closing Date, the Company
shall, directly or indirectly, not consolidate or merge with or into another
person (whether or not the Company is the surviving corporation), or sell,
assign, transfer, convey or otherwise dispose of all or substantially all of the
properties or assets of the Company and its Restricted Subsidiaries taken as a
whole, in one or more related transactions, to another person unless:

                  (i) either: (A) the Company is the surviving corporation or
         (B) the person formed by or surviving any such consolidation or merger
         (if other than the Company) or to which such sale, assignment,
         transfer, conveyance or other disposition has been made is a
         corporation organized or existing under the laws of the United States,
         any state of the United States or the District of Columbia;

                  (ii) the person formed by or surviving any such consolidation
         or merger (if other than the Company) or the person to which such sale,
         assignment, transfer, conveyance or other disposition has been made
         assumes all of the Company's obligations under the Notes and this
         Indenture pursuant to agreements reasonably satisfactory to the
         Trustee;

                  (iii) immediately before and after giving effect to such
         transaction, no Default or Event of Default exists; and

                  (iv) the Company or the person formed by or surviving any such
         consolidation or merger (if other than the Company), or to which such
         sale, assignment, transfer, conveyance or other disposition has been
         made will, on the date of such transaction after giving pro forma
         effect thereto and any related financing transactions as if the same
         had occurred at the beginning of the applicable four-quarter period, be
         permitted to incur at least $1.00 of additional Indebtedness pursuant
         to the Fixed Charge Coverage Ratio test set forth in Section 4.09(b);
         provided, however, that the Company delivers to the Trustee an
         Officers' Certificate, attaching the arithmetic computations to
         demonstrate compliance with this clause (b)(iv), and an Opinion of
         Counsel, in each case stating that such consolidation, merger or
         transfer complies with this provision and that all conditions precedent
         provided for herein relating to such transaction have been complied
         with; and provided further, that this clause (a)(iv) shall not apply
         (A) pursuant to Section 4.20, during any period in which the Company
         and its Restricted Subsidiaries are not subject to the Suspended
         Covenants before such transaction and are not reasonably expected to be
         subject to the Suspended Covenants after giving effect to such
         transaction, and (B) if, in the good faith determination of the Board
         of Directors, the principal purpose of the transaction is to change the
         Company's state of incorporation and the transaction does not have as
         one of its purposes the evasion of the foregoing limitations.

                                      -67-
<PAGE>

                  (c) The Company shall not, directly or indirectly, lease all
or substantially all of its properties or assets, in one or more related
transactions, to any other person.

                  (d) Notwithstanding paragraphs (a), (b) and (c) of this
Section 5.01, none of the above provisions shall prohibit the consummation of
the Merger.

Section 5.02. Successor Corporation Substituted.

                  Upon any consolidation or merger, or any sale, assignment,
transfer, conveyance or other disposition of all or substantially all of the
assets of the Company in accordance with Section 5.01 hereof, the successor
corporation formed by such consolidation or into or with which the Company is
merged or to which such sale, assignment, transfer, conveyance or other
disposition is made shall succeed to, and be substituted for (so that from and
after the date of such consolidation, merger, sale, conveyance or other
disposition, the provisions of this Indenture referring to the "Company" shall
refer instead to the successor corporation and not to the Company), and may
exercise every right and power of the Company under this Indenture with the same
effect as if such successor person had been named as the Company herein;
provided, however, that the predecessor Company shall not be relieved from the
obligation to pay the principal of and interest on the Notes or any other
amounts owing hereunder or under the Notes in the case of a sale or lease of all
or substantially all of the Company's assets that meets the requirements of
Section 5.01 hereof.

                                   ARTICLE 6.

                              DEFAULTS AND REMEDIES

Section 6.01. Events of Default.

                  Each of the following events constitutes an "Event of
Default":

                  (a) default in the payment when due of interest on, or
         Liquidated Damages with respect to, any Note, and such default
         continues for a period of 30 days;

                  (b) default in the payment when due of principal of or
         premium, if any, on any Note when the same becomes due and payable at
         maturity, upon acceleration, upon redemption or otherwise;

                  (c) default in the performance or breach of the provisions by
         the Company or any of its Restricted Subsidiaries of Sections 3.09,
         4.07, 4.09 or 5.01 hereof;

                  (d) default in the performance by the Company or any of its
         Restricted Subsidiaries of Sections 4.15 or 4.16 hereof, and such
         default continues for a period of 30 days after written notice;

                                      -68-
<PAGE>

                  (e) default in the performance of or breaches of any other
         covenant or agreement of the Company in this Indenture or under the
         Notes (other than a default specified in clause (a), (b), (c) or (d)
         above) by the Company or any of its Restricted Subsidiaries, and such
         default or breach continues for a period of 60 days after written
         notice by the Trustee to the Company or by the Holders of 25% or more
         in aggregate principal amount of the Notes to the Company and the
         Trustee;

                  (f) default under any mortgage, indenture or instrument under
         which there may be issued or by which there may be secured or evidenced
         any Indebtedness for money borrowed by the Company or any of its
         Restricted Subsidiaries (or the payment of which is guaranteed by the
         Company or any of its Restricted Subsidiaries) whether such
         Indebtedness or guarantee now exists, or is created after the date
         hereof, if that default:

                           (i) is caused by a failure to pay principal of, or
                  interest or premium, if any, on such Indebtedness prior to the
                  expiration of the grace period provided in such Indebtedness
                  on the date of such default (a "Payment Default"); or

                           (ii) results in the acceleration of such Indebtedness
                  prior to its express maturity,

         and, in each case, the principal amount of any such Indebtedness,
         together with the principal amount of any other such Indebtedness under
         which there has been a Payment Default or the maturity of which has
         been so accelerated, aggregates $10.0 million or more;

                  (g) default by the Company or any of its Subsidiaries in the
         payment of final judgments aggregating in excess of $10.0 million,
         which judgments are not paid, discharged or stayed for a period of 60
         days;

                  (h) except as permitted by this Indenture, any Subsidiary
         Guarantee shall be held in any judicial proceeding to be unenforceable
         or invalid or shall cease for any reason to be in full force and effect
         or any Guarantor, or any person acting on behalf of any Guarantor,
         shall deny or disaffirm its obligations under its Subsidiary Guarantee;

                  (i) a court having jurisdiction in the premises enters a
         decree or order for

                           (i) relief in respect of the Company or any of its
                  Restricted Subsidiaries in an involuntary case under any
                  applicable bankruptcy, insolvency or other similar law now or
                  hereafter in effect,

                           (ii) appointment of a receiver, liquidator, assignee,
                  custodian, trustee, sequestrator or similar official of the
                  Company or any of its Restricted

                                      -69-
<PAGE>

                  Subsidiaries or for all or substantially all of the property
                  and assets of the Company or any of its Restricted
                  Subsidiaries, or

                           (iii) the winding up or liquidation of the affairs of
                  the Company or any of its Restricted Subsidiaries and,

         in each case, such decree or order shall remain unstayed and in effect
         for a period of 30 consecutive days; or

                  (j) the Company or any of its Restricted Subsidiaries:

                           (i) commences a voluntary case under any applicable
                  bankruptcy, insolvency or other similar law now or hereafter
                  in effect, or consents to the entry of an order for relief in
                  an involuntary case under any such law,

                           (ii) consents to the appointment of or taking
                  possession by a receiver, liquidator, assignee, custodian,
                  trustee, sequestrator or similar official of the Company or
                  such Restricted Subsidiary or for all or substantially all of
                  the property and assets of the Company or such Restricted
                  Subsidiary,

                           (iii) effects any general assignment for the benefit
                  of creditors.

Section 6.02. Acceleration.

                  (a) If any Event of Default (other than an Event of Default
specified in clause (i) or (j) of Section 6.01 hereof), occurs and is
continuing, the Trustee or the Holders of at least 25% in principal amount of
the then outstanding Notes, by written notice to the Company (and, if such
notice is given by such Holders, to the Trustee), may, and the Trustee at the
request of such Holders shall, declare the principal of, premium, if any, and
accrued interest on the Notes to be due and payable immediately. Upon such
declaration of acceleration, such principal of, premium, if any, and accrued and
unpaid interest and Liquidated Damages, if any, shall be immediately due and
payable.

                  (b) Notwithstanding the foregoing, if an Event of Default
specified in clause (i) or (j) of Section 6.01 hereof occurs with respect to the
Company, any Restricted Subsidiary that is a Significant Subsidiary or any group
of Restricted Subsidiaries that, taken together, would constitute a Significant
Subsidiary, the principal of, premium, if any, and accrued and unpaid interest
and Liquidated Damages, if any, on the Notes then outstanding shall be due and
payable immediately without further action or notice on the part of the Trustee
or any Holder.

                                      -70-
<PAGE>

Section 6.03. Other Remedies.

                  If an Event of Default occurs and is continuing, the Trustee
may pursue any available remedy to collect the payment of principal, premium, if
any, and interest on the Notes or to enforce the performance of any provision of
the Notes or this Indenture.

                  The Trustee may maintain a proceeding to enforce its rights
and to pursue its remedies under the Notes and this Indenture even if the
Trustee does not possess any of the Notes or does not produce any of them in the
proceeding. A delay or omission by the Trustee or any Holder of a Note in
exercising any right or remedy accruing upon an Event of Default shall not
impair the right or remedy or constitute a waiver of or acquiescence in the
Event of Default. All remedies are cumulative to the extent permitted by law.

Section 6.04. Waiver of Past Defaults.

                  At any time after declaration of acceleration, but before a
judgment or decree for the payment of the money due has been obtained by the
Trustee, the Holders of at least a majority in principal amount of the
outstanding Notes by written notice to the Company and to the Trustee, may waive
all past defaults, except a Default in the payment of principal of premium, if
any, or interest on any Note as specified in clause (a) or (b) of Section 6.01
or in respect of a covenant or provision of this Indenture which cannot be
modified or amended without the consent of the Holder of each outstanding Note
affected, and rescind and annul a declaration of acceleration and its
consequences if:

                  (a) all existing Events of Default, other than the nonpayment
         of the principal of, premium, if any, and interest on the Notes that
         have become due solely by such declaration of acceleration, have been
         cured or waived; and

                  (b) such rescission would not conflict with any judgment or
         decree of a court of competent jurisdiction.

                  Upon any such waiver, such Default shall cease to exist, and
any Event of Default arising therefrom shall be deemed to have been cured, for
every purpose of this Indenture; but no such waiver shall extend to any
subsequent or other Default or Event of Default or impair any right consequent
thereto.

Section 6.05. Control by Majority.

                  Holders of a majority in principal amount of the then
outstanding Notes may direct the time, method and place of conducting any
proceeding for enforcing any rights and exercising any remedy available to the
Trustee or exercising any trust or power conferred on it. However, the Trustee
may refuse to follow any direction that conflicts with law or this Indenture
that the Trustee determines may involve the Trustee in personal liability or
that the Trustee determines in good faith may be unduly prejudicial to the
rights of other Holders of

                                      -71-
<PAGE>

Notes not joining in the giving of such direction and may take any other action
it deems proper that is not inconsistent with any such direction received for
Holders of Notes.

Section 6.06. Limitation on Suits.

                  A Holder of a Note may pursue a remedy with respect to this
Indenture or the Notes only if:

                  (a) the Holder of a Note gives to the Trustee written notice
         of a continuing Event of Default;

                  (b) the Holders of at least 25% in principal amount of the
         then outstanding Notes make a written request to the Trustee to pursue
         the remedy;

                  (c) such Holder of a Note or Holders of Notes offer and, if
         requested, provide to the Trustee indemnity satisfactory to the Trustee
         against any loss, liability or expense;

                  (d) the Trustee does not comply with the request within 60
         days after receipt of the request and the offer and, if requested, the
         provision of indemnity; and

                  (e) during such 60-day period the Holders of a majority in
         principal amount of the then outstanding Notes do not give the Trustee
         a direction inconsistent with the request.

                  A Holder of a Note may not use this Indenture to prejudice the
rights of another Holder of a Note or to obtain a preference or priority over
another Holder of a Note.

Section 6.07. Rights of Holders of Notes to Receive Payment.

                  Notwithstanding any other provision of this Indenture, the
right of any Holder of a Note to receive payment of principal, premium and
Liquidated Damages, if any, and interest on the Note, on or after the respective
due dates expressed in the Note (including in connection with an offer to
purchase), or to bring suit for the enforcement of any such payment on or after
such respective dates, shall not be impaired or affected without the consent of
such Holder.

Section 6.08. Collection Suit by Trustee.

                  If an Event of Default specified in Section 6.01(a) or (b)
occurs and is continuing, the Trustee is authorized to recover judgment in its
own name and as Trustee of an express trust against the Company for the whole
amount of principal of, premium and Liquidated Damages, if any, and interest
remaining unpaid on the Notes and interest on overdue principal and, to the
extent lawful, interest and such further amount as shall be sufficient to

                                      -72-
<PAGE>

cover the costs and expenses of collection, including the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel.

Section 6.09. Trustee May File Proofs of Claim.

                  The Trustee is authorized to file such proofs of claim and
other papers or documents as may be necessary or advisable in order to have the
claims of the Trustee (including any claim for the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel) and
the Holders of the Notes allowed in any judicial proceedings relative to the
Company (or any other obligor upon the Notes), its creditors or its property and
shall be entitled and empowered to collect, receive and distribute any money or
other property payable or deliverable on any such claims and any custodian in
any such judicial proceeding is hereby authorized by each Holder to make such
payments to the Trustee, and in the event that the Trustee shall consent to the
making of such payments directly to the Holders, to pay to the Trustee any
amount due to it for the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, and any other amounts due the
Trustee under Section 7.07 hereof. To the extent that the payment of any such
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, and any other amounts due the Trustee under Section 7.07 hereof out
of the estate in any such proceeding, shall be denied for any reason, payment of
the same shall be secured by a Lien on, and shall be paid out of, and to secure
the payment of same, the Trustee is hereby granted an interest security in, any
and all distributions, dividends, money, securities and other properties that
the Holders may be entitled to receive in such proceeding whether in liquidation
or under any plan of reorganization or arrangement or otherwise. Nothing herein
contained shall be deemed to authorize the Trustee to authorize or consent to or
accept or adopt on behalf of any Holder any plan of reorganization, arrangement,
adjustment or composition affecting the Notes or the rights of any Holder, or to
authorize the Trustee to vote in respect of the claim of any Holder in any such
proceeding.

Section 6.10. Priorities.

                  If the Trustee collects any money pursuant to this Article, it
shall pay out the money in the following order:

                  First: to the Trustee, its agents and attorneys for amounts
         due under Sections 6.09 and 7.07 hereof, including payment of all
         compensation, expense and liabilities incurred, and all advances made,
         by the Trustee, its agents or attorneys and the costs and expenses of
         collection;

                  Second: to Holders of Notes for amounts due and unpaid on the
         Notes for principal, premium and Liquidated Damages, if any, and
         interest, ratably, without preference or priority of any kind,
         according to the amounts due and payable on the

                                      -73-
<PAGE>

         Notes for principal, premium and Liquidated Damages, if any and
         interest, respectively; and

                  Third: to the Company or to such party as a court of competent
         jurisdiction shall direct.

                  The Trustee may fix a record date and payment date for any
payment to Holders of Notes pursuant to this Section 6.10.

Section 6.11. Undertaking for Costs.

                  In any suit for the enforcement of any right or remedy under
this Indenture or in any suit against the Trustee for any action taken or
omitted by it as a Trustee, a court in its discretion may require the filing by
any party litigant in the suit of an undertaking to pay the costs of the suit,
and the court in its discretion may assess reasonable costs, including
reasonable attorneys' fees and disbursements against any party litigant in the
suit, having due regard to the merits and good faith of the claims or defenses
made by the party litigant. This Section does not apply to a suit by the
Trustee, a suit by a Holder of a Note pursuant to Section 6.07 hereof, or a suit
by Holders of more than 10% in principal amount of the then outstanding Notes.

Section 6.12. Restoration of Rights and Remedies.

                  If the Trustee or any Holder has instituted any proceeding to
enforce any right or remedy under this Indenture and such proceeding has been
discontinued or abandoned for any reason, or has been determined adversely to
the Trustee or to such Holder, then, and in every such case, subject to any
determination in such proceeding, the Company, the Trustee and the Holders shall
be restored severally and respectively to their former positions hereunder and
thereafter all rights and remedies of the Company, Trustee and the Holders shall
continue as though no such proceeding had been instituted, except that the
rights of the Trustee to receive compensation, reimbursement of any of its
expenses or indemnification from the Holders in connection with such proceeding
in accordance with the terms of this Indenture or any separate agreement or
understanding between the Trustees and the Holders shall not be affected by this
Section 6.12.

Section 6.13. Rights and Remedies Cumulative.

                  Except as otherwise provided with respect to the replacement
or payment of mutilated, destroyed, lost or wrongfully taken Notes in Section
2.07, no right or remedy herein conferred upon or reserved to the Trustee or to
the Holders is intended to be exclusive of any other right or remedy, and every
right and remedy shall, to the extent permitted by law, be cumulative and in
addition to every other right and remedy given hereunder or now or hereafter
existing at law or in equity or otherwise. The assertion or employment of any
right or

                                      -74-
<PAGE>

remedy hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

Section 6.14. Delay or Omission Not Waiver.

                  No delay or omission of the Trustee or of any Holder to
exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an
acquiescence therein. Every right and remedy given by this Article 6 or by law
to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee or by the Holders, as the case
may be.

                                   ARTICLE 7.

                                     TRUSTEE

Section 7.01. Duties of Trustee.

                  (a) If an Event of Default has occurred and is continuing, the
Trustee shall exercise such of the rights and powers of which the Trustee has
actual knowledge vested in it by this Indenture, and use the same degree of care
and skill in its exercise, as a prudent man would exercise or use under the
circumstances in the conduct of his own affairs.

                  (b) Except during the continuance of an Event of Default of
which the Trustee has actual knowledge :

                  (i) the duties of the Trustee shall be determined solely by
         the express provisions of this Indenture and the Trustee undertakes to
         perform, and need perform, only those duties that are specifically set
         forth in this Indenture and no others, and no implied covenants or
         obligations shall be read into this Indenture against the Trustee; and

                  (ii) in the absence of bad faith on its part, the Trustee may
         conclusively rely, as to the truth of the statements and the
         correctness of the opinions expressed therein, upon certificates or
         opinions furnished to the Trustee and conforming to the requirements of
         this Indenture. However, the Trustee shall examine the certificates and
         opinions to determine whether or not they conform to the requirements
         of this Indenture.

                  (c) The Trustee may not be relieved from liabilities for its
own negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

                  (i) this paragraph does not limit the effect of paragraph (b)
         of this Section;

                                      -75-
<PAGE>

                  (ii) the Trustee shall not be liable for any error of judgment
         made in good faith by a Responsible Officer, unless it is proved that
         the Trustee was negligent in ascertaining the pertinent facts; and

                  (iii) the Trustee shall not be liable with respect to any
         action it takes or omits to take in good faith in accordance with a
         direction received by it pursuant to Section 6.05 hereof.

                  (d) Whether or not therein expressly so provided, every
provision of this Indenture that in any way relates to the Trustee is subject to
paragraphs (a), (b), (c), (e) and (f) of this Section and Section 7.02.

                  (e) No provision of this Indenture shall require the Trustee
to expend or risk its own funds or incur any liability. The Trustee shall be
under no obligation to exercise any of its rights and powers under this
Indenture at the request of any Holders, unless such Holder shall have offered
to the Trustee security and indemnity satisfactory to the Trustee against any
loss, liability or expense.

                  (f) The Trustee shall not be liable for interest on any money
received by it except as the Trustee may agree in writing with the Company.
Money held in trust by the Trustee need not be segregated from other funds
except to the extent required by law.

Section 7.02. Rights of Trustee.

                  (a) In connection with its rights and duties under this
Indenture, the Trustee may conclusively rely and shall be fully protected in
acting or refraining from acting upon any resolution, certificate, statement,
instrument, opinion, report, notice, request, consent, order, Note, or other
document believed by it to be genuine and to have been signed or presented by
the proper person. The Trustee need not investigate any fact or matter stated in
the document.

                  (b) Before the Trustee acts or refrains from acting, it may
require an Officers' Certificate or an Opinion of Counsel or both. The Trustee
shall not be liable for any action it takes or omits to take in good faith in
reliance on such Officers' Certificate or Opinion of Counsel. The Trustee may
consult with counsel and the written advice of such counsel or any Opinion of
Counsel shall be full and complete authorization and protection from liability
in respect of any action taken, suffered or omitted by it hereunder in good
faith and in reliance thereon.

                  (c) The Trustee may act through its attorneys and agents and
shall not be responsible for the misconduct or negligence of any agent appointed
with due care.

                  (d) The Trustee shall not be liable for any action it takes or
omits to take in good faith that it believes to be authorized or within the
rights or powers conferred upon it by this Indenture or takes or omits to take
in accordance with the written direction of the Holders

                                      -76-
<PAGE>

of a majority in principal amount of the outstanding Notes relating to the time,
method and place of conducting any proceeding for any remedy available to the
Trustee, or exercising any trust or power conferred upon the Trustee, under this
Indenture.

                  (e) Unless otherwise specifically provided in this Indenture,
any demand, request, direction or notice from the Company shall be sufficient if
signed by an Officer of the Company.

                  (f) The Trustee shall be under no obligation to exercise any
of the rights or powers vested in it by this Indenture at the request or
direction of any of the Holders unless such Holders shall have offered to the
Trustee security or indemnity reasonably satisfactory to it against the costs,
expenses and liabilities that might be incurred by it in compliance with such
request or direction.

                  (g) The Trustee shall not be bound to make any investigation
into the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, other evidence of indebtedness or other paper or document, but
the Trustee, in its discretion, may make such further inquiry or investigation
into such facts or matters as it may see fit, and, if the Trustee shall
determine to make such further inquiry or investigation, it shall be entitled to
examine the books, records and premises of the Company personally or by agent or
attorney.

                  (h) Except with respect to Section 4.01, the Trustee shall
have no duty to inquire as to the performance of the Company's covenants set
forth in Article 4. The Trustee shall not be deemed to have knowledge of any
Default or Event of Default except (i) any Event of Default occurring pursuant
to Sections 6.01(a), 6.01(b) and 4.01 or (ii) any Default or Event of Default of
which the Trustee shall have received written notification in the manner set
forth in this Indenture or a Responsible Officer of the Trustee shall have
obtained actual knowledge of the Default or Event of Default.

Section 7.03. Individual Rights of Trustee.

                  The Trustee in its individual or any other capacity may become
the owner or pledgee of Notes and may otherwise deal with the Company or any
Affiliate of the Company with the same rights it would have if it were not
Trustee. However, in the event that the Trustee acquires any conflicting
interest it must eliminate such conflict within 90 days, apply to the Commission
for permission to continue as Trustee or resign. Any Agent may do the same with
like rights and duties. The Trustee is also subject to Sections 7.10 and 7.11
hereof.

Section 7.04. Trustee's Disclaimer.

                  The Trustee shall not be responsible for and makes no
representation as to the validity or adequacy of this Indenture or the Notes, it
shall not be accountable for the Company's use of the proceeds from the Notes or
any money paid to the Company or upon the

                                      -77-
<PAGE>

Company's direction under any provision of this Indenture, it shall not be
responsible for the use or application of any money received by any Paying Agent
other than the Trustee, and it shall not be responsible for any statement or
recital herein or any statement in the Notes or any other document in connection
with the sale of the Notes or pursuant to this Indenture other than its
certificate of authentication.

Section 7.05. Notice of Defaults.

                  If a Default or Event of Default occurs and is continuing and
if it is known to the Trustee, the Trustee shall mail to Holders of Notes a
notice of the Default or Event of Default within 90 days after it occurs. Except
in the case of a Default or Event of Default in payment of principal of,
premium, if any, or interest on any Note, the Trustee may withhold the notice if
and so long as a committee of its Responsible Officers in good faith determines
that withholding the notice is in the interests of the Holders of the Notes.

Section 7.06. Reports by Trustee to Holders of the Notes.

                  Within 60 days after each May 15 beginning with May 15, 2003,
and for so long as Notes remain outstanding, the Trustee shall mail to the
Holders of the Notes a brief report dated as of such reporting date that
complies with TIA Section 313(a) (but if no event described in TIA Section
313(a) has occurred within the twelve months preceding the reporting date, no
report need be transmitted). The Trustee also shall comply with TIA Section
313(b)(2). The Trustee shall also transmit by mail all reports as required by
TIA Section 313(c).

                  A copy of each report at the time of its mailing to the
Holders of Notes shall be mailed to the Company and filed with the Commission
and each stock exchange on which the Notes are listed in accordance with TIA
Section 313(d). The Company shall promptly notify the Trustee when the Notes are
listed on any stock exchange.

Section 7.07. Compensation and Indemnity.

                  The Company shall pay to the Trustee from time to time such
compensation for its acceptance of this Indenture and services hereunder as
shall be agreed upon in writing by the Company and the Trustee. The Trustee's
compensation shall not be limited by any law on compensation of a Trustee of an
express trust. The Company shall reimburse the Trustee promptly upon request for
all reasonable disbursements, advances and expenses incurred or made by it in
addition to the compensation for its services. Such expenses shall include the
reasonable compensation, disbursements and expenses of the Trustee's agents and
counsel.

                  The Company shall indemnify, defend and hold harmless the
Trustee and its shareholders, incorporators, directors, officers, employees,
representatives and agents (each an "Indemnitee") against any and all losses,
liabilities or expenses (including reasonable fees and disbursements of counsel)
incurred by any of them arising out of or in connection with the acceptance or
administration of the Trustee's duties under this Indenture, including the costs
and

                                      -78-
<PAGE>

expenses of enforcing this Indenture against the Company (including this Section
7.07) and defending any of themselves against any claim (whether asserted by the
Company or any Holder or any other person) or liability in connection with the
exercise or performance of any of the Trustee's powers or duties hereunder,
except to the extent any such loss, liability or expense or a portion thereof
may be attributable to the Trustee's negligence or bad faith. An Indemnitee
shall notify the Company promptly of any claim for which that Indemnitee may
seek indemnity. Failure by the Indemnitee to so notify the Company shall not
relieve the Company of its obligations hereunder. Subject to receipt of the
consent of the party to be defended, which consent shall not be unreasonable
withheld or delayed, the Company shall defend the claim and the Trustee shall
cooperate in the defense. The Indemnitees may have separate counsel and the
Company shall pay the reasonable fees and expenses of such counsel. The Company
need not pay for any settlement made without its consent, which consent shall
not be unreasonably withheld or delayed. The Company need not reimburse any
expense or indemnify against any loss, liability or expense incurred by an
Indemnitee through that Indemnitee's own willful misconduct, negligence or bad
faith.

                  The obligations of the Company under this Section 7.07 shall
survive the resignation or removal of the Trustee and the satisfaction and
discharge of this Indenture.

                  To secure the Company's payment obligations in this Section,
the Trustee shall have a Lien and is hereby granted a security interest prior in
right of payment prior to the Notes on all money or property held or collected
by the Trustee, except that held in trust to pay principal and interest on
particular Notes. Such Lien shall survive the satisfaction and discharge of this
Indenture.

                  When the Trustee incurs expenses or renders services after an
Event of Default specified in Section 6.01(g) or (h) hereof occurs, the expenses
and the compensation for the services (including the fees, disbursements and
expenses of its agents and counsel) are intended to constitute expenses of
administration under any Bankruptcy Law.

                  The Trustee shall comply with the provisions of TIA Section
313(b)(2) to the extent applicable.

Section 7.08. Replacement of Trustee.

                  A resignation or removal of the Trustee and appointment of a
successor Trustee shall become effective only upon the successor Trustee's
acceptance of appointment as provided in this Section.

                  The Trustee may resign in writing at any time and be
discharged from the trust hereby created by so notifying the Company. The
Holders of Notes of a majority in principal amount of the then outstanding Notes
may remove the Trustee by so notifying the Trustee and the Company in writing.
The Company may remove the Trustee if:

                                      -79-
<PAGE>

                  (a) the Trustee fails to comply with Section 7.10 hereof;

                  (b) the Trustee is adjudged a bankrupt or an insolvent or an
         order for relief is entered with respect to the Trustee under any
         Bankruptcy Law;

                  (c) a custodian or public officer takes charge of the Trustee
         or its property; or

                  (d) the Trustee becomes incapable of acting.

                  If the Trustee resigns or is removed or if a vacancy exists in
the office of Trustee for any reason, the Company shall promptly appoint a
successor Trustee. Within one year after the successor Trustee takes office, the
Holders of a majority in principal amount of the then outstanding Notes may
appoint a successor Trustee to replace the successor Trustee appointed by the
Company.

                  If a successor Trustee does not take office within 60 days
after the retiring Trustee resigns or is removed, the retiring Trustee, the
Company, or the Holders of Notes of at least 10% in principal amount of the then
outstanding Notes may petition any court of competent jurisdiction for the
appointment of a successor Trustee.

                  If the Trustee, after written request by any Holder of a Note
who has been a Holder of a Note for at least six months, fails to comply with
Section 7.10, such Holder of a Note may petition any court of competent
jurisdiction for the removal of the Trustee and the appointment of a successor
Trustee.

                  A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company. Thereupon, the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture. The successor Trustee shall mail a notice of its
succession to Holders of the Notes. Subject to the Lien provided for in Section
7.07 hereof, the retiring Trustee shall promptly transfer all property held by
it as Trustee to the successor Trustee; provided, however, that all sums owing
to the retiring Trustee hereunder shall have been paid and the property so
transferred shall remain subject to the Lien provided for in Section 7.07.
Notwithstanding replacement of the Trustee pursuant to this Section 7.08, the
Company's obligations under Section 7.07 hereof shall continue for the benefit
of the retiring Trustee.

Section 7.09. Successor Trustee by Merger, etc.

                  If the Trustee consolidates, merges or converts into, or
transfers all or substantially all of its corporate trust business to, another
corporation or national banking corporation, the successor corporation or
national banking corporation without any further act shall be the successor
Trustee.

                                      -80-
<PAGE>

Section 7.10. Eligibility; Disqualification.

                  There shall at all times be a Trustee hereunder that is a
corporation organized and doing business under the laws of the United States of
America or of any state thereof that is authorized under such laws to exercise
corporate Trustee power, that is subject to supervision or examination by
federal or state authorities and that has (or the bank holding company of which
it is an Affiliate has) a combined capital and surplus of at least $50 million
as set forth in its most recent published annual report of condition.

                  This Indenture shall always have a Trustee who satisfies the
requirements of TIA Section 310(a)(1), (2) and (5). The Trustee is subject to
TIA Section 310(b); provided, however, that there shall be excluded from the
operation of TIA Section 310(b)(1) any indenture or indentures under which other
securities or certificates of interest or participation in other securities of
the Company are outstanding if the requirements for such exclusions set forth in
TIA Section 310(b)(1) are met.

Section 7.11. Preferential Collection of Claims Against Company.

                  The Trustee is subject to TIA Section 311(a), excluding any
creditor relationship listed in TIA Section 311(b). A Trustee who has resigned
or been removed shall be subject to TIA Section 311(a) to the extent indicated
therein.

                                   ARTICLE 8.

                                 NOTE GUARANTEES

Section 8.01. Subsidiary Guarantees.

                  (a) Subject to this Article 8, each of the Guarantors, from
time to time party hereto, hereby, jointly and severally, unconditionally
guarantees to each Holder of a Note authenticated and delivered by the Trustee
and to the Trustee and its successors and assigns, irrespective of the validity
and enforceability of this Indenture, the Notes or the obligations of the
Company hereunder or thereunder, that: (i) the principal of premium, if any, and
interest on the Notes will be promptly paid in full when due, whether at
maturity, by acceleration, redemption or otherwise, and interest on the overdue
principal of and interest on the Notes, if any, if lawful, and all other
obligations of the Company to the Holders or the Trustee hereunder or thereunder
will be promptly paid in full or performed, all in accordance with the terms
hereof and thereof; and (ii) in case of any extension of time of payment or
renewal of any Notes or any of such other obligations, that same will be
promptly paid in full when due or performed in accordance with the terms of the
extension or renewal, whether at stated maturity, by acceleration pursuant to
Section 6.02 hereof or otherwise. Failing payment when due of any amount so
guaranteed or any performance so guaranteed for whatever reason, the

                                      -81-
<PAGE>

Guarantors shall be jointly and severally obligated to pay the same immediately.
Each Guarantor agrees that this is a guarantee of payment and not a guarantee of
collection.

                  (b) Each Guarantor hereby agrees that its obligations with
regard to such Subsidiary Guarantee shall be joint and several, unconditional,
irrespective of the validity or enforceability of the Notes or the obligations
of the Company under this Indenture, the absence of any action to enforce the
same, the recovery of any judgment against the Company or any other obligor with
respect to this Indenture, the Notes or the obligations of the Company under
this Indenture or the Notes, any action to enforce the same or any other
circumstances (other than complete performance) which might otherwise constitute
a legal or equitable discharge or defense of a Guarantor. Each Guarantor
further, to the extent permitted by law, waives and relinquishes all claims,
rights and remedies accorded by applicable law to guarantors and agrees not to
assert or take advantage of any such claims, rights or remedies, including but
not limited to: (i) any right to require any of the Trustee, the Holders or the
Company (each a, "Benefited Party"), as a condition of payment or performance by
such Guarantor, to (A) proceed against the Company, any other guarantor
(including any other Guarantor) of the obligations under the Subsidiary
Guarantees or any other person, (B) proceed against or exhaust any security held
from the Company, any such other guarantor or any other person, (C) proceed
against or have resort to any balance of any deposit account or credit on the
books of any Benefited Party in favor of the Company or any other person, or (D)
pursue any other remedy in the power of any Benefited Party whatsoever; (ii) any
defense arising by reason of the incapacity, lack of authority or any disability
or other defense of the Company including any defense based on or arising out of
the lack of validity or the unenforceability of the obligations under the
Subsidiary Guarantees or any agreement or instrument relating thereto or by
reason of the cessation of the liability of the Company from any cause other
than payment in full of the obligations under the Subsidiary Guarantees; (iii)
any defense based upon any statute or rule of law which provides that the
obligation of a surety must be neither larger in amount nor in other respects
more burdensome than that of the principal; (iv) any defense based upon any
Benefited Party's errors or omissions in the administration of the obligations
under the Subsidiary Guarantees, except behavior which amounts to bad faith;
(v)(A) any principles or provisions of law, statutory or otherwise, which are or
might be in conflict with the terms of the Subsidiary Guarantees and any legal
or equitable discharge of such Guarantor's obligations hereunder, (B) the
benefit of any statute of limitations affecting such Guarantor's liability
hereunder or the enforcement hereof, (C) any rights to set-offs, recoupments and
counterclaims and (D) promptness, diligence and any requirement that any
Benefited Party protect, secure, perfect or insure any security interest or lien
or any property subject thereto; (vi) notices, demands, presentations, protests,
notices of protest, notices of dishonor and notices of any action or inaction,
including acceptance of the Subsidiary Guarantees, notices of default under the
Notes or any agreement or instrument related thereto, notices of any renewal,
extension or modification of the obligations under the Subsidiary Guarantees or
any agreement related thereto, and notices of any extension of credit to the
Company and any right to consent to any thereof; (vii) to the extent permitted
under applicable law, the benefits of any "One Action" rule and (viii) any
defenses or benefits that may be derived from or afforded by

                                      -82-
<PAGE>

law which limit the liability of or exonerate guarantors or sureties, or which
may conflict with the terms of the Subsidiary Guarantees. Except as set forth in
Section 8.6, each Guarantor hereby covenants that its Subsidiary Guarantee will
not be discharged except by complete performance of the obligations contained in
its Guarantee and this Indenture.

                  (c) If any Holder or the Trustee is required by any court or
otherwise to return to the Company, the Guarantors or any custodian, trustee,
liquidator or other similar official acting in relation to either the Company or
the Guarantors, any amount paid by either to the Trustee or such Holder, any
Subsidiary Guarantee, to the extent theretofore discharged, shall be reinstated
in full force and effect.

                  (d) Each Guarantor agrees that it shall not be entitled to any
right of subrogation in relation to the Holders in respect of any obligations
guaranteed hereby until payment in full of all obligations guaranteed hereby.
Each Guarantor further agrees that, as between the Guarantors, on the one hand,
and the Holders and the Trustee, on the other hand, (i) the maturity of the
obligations guaranteed hereby may be accelerated as provided in Section 6.02
hereof for the purposes of any Subsidiary Guarantee, notwithstanding any stay,
injunction or other prohibition preventing such acceleration in respect of the
obligations guaranteed hereby and (ii) in the event of any declaration of
acceleration of such obligations as provided in Section 6.02 hereof, such
obligations (whether or not due and payable) shall forthwith become due and
payable by the Guarantors for the purpose of any such Subsidiary Guarantee. The
Guarantors shall have the right to seek contribution from any non-paying
Guarantor so long as the exercise of such right does not impair the rights of
the Holders under the applicable Subsidiary Guarantee.

Section 8.02. Additional Guarantees.

                  If any Restricted Subsidiary becomes obligated pursuant to
Section 4.12 hereof, then the Company shall cause any such Restricted Subsidiary
to, within ten Business Days of the date on which any such Restricted Subsidiary
became so obligated, (a) execute and deliver to the Trustee a Supplemental
Indenture in form reasonably satisfactory to the Trustee pursuant to which such
Restricted Subsidiary shall unconditionally guarantee, on a senior unsecured
basis, all of the Company's obligations under the Notes and this Indenture on
the terms set forth herein and therein and (b) deliver to the Trustee an Opinion
of Counsel that, subject to customary assumptions and exclusions, such
supplemental indenture has been duly executed and delivered by such Restricted
Subsidiary. Any Restricted Subsidiary that becomes a Guarantor shall remain a
Guarantor unless (i) designated an Unrestricted Subsidiary by the Company in
accordance with this Indenture; (ii) is otherwise released from its obligations
as a Guarantor pursuant to Section 8.05 hereof; or (iii) the circumstances
giving rise to the obligation to provide a guarantee under Section 4.12 no
longer exist.

                                      -83-
<PAGE>

Section 8.03. Limitation on Guarantor Liability.

                  Each Guarantor, and by its acceptance of Notes, each Holder,
hereby confirms that it is the intention of all such parties that the Subsidiary
Guarantee of such Guarantor not constitute a fraudulent transfer or conveyance
for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the
Uniform Fraudulent Transfer Act or any similar federal or state law to the
extent applicable to any Subsidiary Guarantee. To effectuate the foregoing
intention, the Trustee, the Holders and the Guarantors hereby irrevocably agree
that the obligations of such Guarantor under this Article 8 shall be limited to
the maximum amount as will, after giving effect to such maximum amount and all
other contingent and fixed liabilities of such Guarantor that are relevant under
such laws, and after giving effect to any collections from, rights to receive
contribution from or payments made by or on behalf of any other Guarantor in
respect of the obligations of such other Guarantor under this Article 8, result
in the obligations of such Guarantor under its Subsidiary Guarantee not
constituting a fraudulent transfer or conveyance.

Section 8.04. Merger and Consolidation of Guarantors.

                  Except as otherwise provided in Section 8.05 hereof, no
Guarantor may sell or otherwise dispose of all or substantially all of its
assets to, or consolidate with or merge with or into (whether or not such
Guarantor is the surviving person) another person, other than the Company or
another Guarantor unless:

                  (a) immediately after giving effect to such transaction, no
         Default or Event of Default exists; and

                  (b) either (i) the person acquiring the property in any such
         sale or disposition or the person formed by or surviving any such
         consolidation or merger, assumes all the obligations of that Guarantor
         under this Indenture and the Subsidiary Guarantee of such Guarantor
         pursuant to a supplemental indenture reasonably satisfactory to the
         Trustee, or (ii) in the case of a sale or other disposition of all or
         substantially all of the assets of such Guarantor's assets, the Net
         Proceeds of such sale of other disposition are applied in accordance
         with Section 4.15.

                  In case of any such sale or other disposition, consolidation,
merger, sale or conveyance and upon the assumption by the successor person, by
supplemental indenture, executed and delivered to the Trustee and satisfactory
in form to the Trustee, of the Subsidiary Guarantee endorsed upon the Notes and
the due and punctual performance of all of the covenants and conditions of this
Indenture to be performed by the Guarantor, such successor person shall succeed
to and be substituted for the Guarantor with the same effect as if it had been
named herein as a Guarantor. Such successor person thereupon may cause to be
signed any or all of the Subsidiary Guarantees to be endorsed upon all of the
Notes issuable hereunder which theretofore shall not have been signed by the
Company and delivered to the Trustee.

                                      -84-
<PAGE>

All the Subsidiary Guarantees so issued shall in all respects have the same
legal rank and benefit under this Indenture as the Subsidiary Guarantees
theretofore and thereafter issued in accordance with the terms of this Indenture
as though all of such Subsidiary Guarantees had been issued at the date of the
execution hereof.

                  Except as set forth in Articles 4 and 5 hereof, and
notwithstanding clauses (a) and (b) of this Section 8.04, nothing contained in
this Indenture or in any of the Notes shall prevent any consolidation or merger
of a Guarantor with or into an Company or another Guarantor, or shall prevent
any sale or conveyance of the property of a Guarantor as an entirety or
substantially as an entirety to an Company or another Guarantor.

Section 8.05. Release.

                  (a) In the event of (i) a sale or other disposition of all or
substantially all of the assets of any Guarantor, by way of merger,
consolidation or otherwise, or a sale or other disposition of all to the Capital
Stock of any Guarantor, in each case to a person that is not (either before or
after giving effect to such transactions) a Subsidiary of the Company, so long
as the Net Proceeds of such sale or other disposition are applied in accordance
with the applicable provisions of this Indenture, including without limitation
Section 4.15 hereof, or (ii) a designation by the Company of any Restricted
Subsidiary that is a Guarantor as an Unrestricted Subsidiary in accordance with
Section 4.13, such Guarantor or, in the case of a sale or other disposition of
all or substantially all of the assets of such Guarantor, the corporation
acquiring such property, will be released and relieved of any obligations under
its Subsidiary Guarantee.

                  (b) Upon delivery by the Company to the Trustee of an
Officers' Certificate and an Opinion of Counsel to the effect that such sale or
other disposition was made by the Company in accordance with the provisions of
this Indenture, including without limitation Section 4.07 hereof, or such
designation was made in accordance with Section 4.13 hereof, as the case may be,
the Trustee shall execute any documents reasonably required in order to evidence
the release of any Guarantor from its obligations under its Subsidiary
Guarantee.

                  (c) Any Guarantor not released from its obligations under its
Subsidiary Guarantee shall remain liable for the full amount of principal of and
interest on the Notes and for the other obligations of any Guarantor under this
Indenture as provided in this Article 8.

                                   ARTICLE 9.

                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 9.01. Option to Effect Legal Defeasance or Covenant Defeasance.

                  The Company may, at the option of its Board of Directors
evidenced by a resolution set forth in an Officers' Certificate, at any time,
elect to have either Section 9.02 or 9.03

                                      -85-
<PAGE>

hereof be applied to all outstanding Notes upon compliance with the conditions
set forth below in this Article 9.

Section 9.02. Legal Defeasance and Discharge.

                  Upon the Company's exercise under Section 9.01 hereof of the
option applicable to this Section 9.02, the Company shall, subject to the
satisfaction of the conditions set forth in Section 9.04 hereof, be deemed to
have been discharged from its obligations with respect to all outstanding Notes
on the date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance"). For this purpose, Legal Defeasance means that the Company shall be
deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to the "outstanding" only
for the purposes of Section 9.05 hereof and the other Sections of this Indenture
referred to in clauses (a) through (d) below, and to have satisfied all their
other obligations under such Notes and this Indenture (and the Trustee, on
demand of and at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following provisions which shall survive
until otherwise terminated or discharged hereunder:

                  (a) the rights of Holders to receive payments in respect of
         the principal of, premium, if any, and interest on the Notes when such
         payments are due;

                  (b) the Company's obligations with respect to the Notes
         concerning issuing temporary Notes, registration of Notes, mutilated,
         destroyed, lost or stolen Notes and the maintenance of an office or
         agency for payments;

                  (c) the rights, powers, trust, duties and immunities of the
         Trustee and the Company's obligations in connection therewith; and

                  (d) the Legal Defeasance provisions of this Article 9.

                  Subject to compliance with this Article 9, the Company may
exercise its option under this Section 9.02, notwithstanding the prior exercise
of its option under Section 9.03 hereof.

Section 9.03. Covenant Defeasance.

                  Upon the Company's exercise under Section 9.01 hereof of the
option applicable to this Section 9.03, the Company shall, subject to the
satisfaction of the conditions set forth in Section 9.04 hereof, be released
from its obligations under the covenants contained in Sections 4.07 through 4.13
and 4.15 through 4.20 hereof, both inclusive, and Section 5.01(b)(iv) with
respect to the outstanding Notes on and after the date the conditions set forth
below are satisfied (hereinafter, "Covenant Defeasance"), and the Notes shall
thereafter be deemed not "outstanding" for the purposes of any direction,
waiver, consent or declaration or act of holders (and the consequences of any
thereof) in connection with such covenants, but

                                      -86-
<PAGE>

shall continue to be deemed "outstanding" for all other purposes hereunder (it
being understood that such Notes shall not be deemed outstanding for accounting
purposes). For this purpose, Covenant Defeasance means that, with respect to the
outstanding Notes, the Company may omit to comply with and shall have no
liability in respect of any term, condition or limitation set forth in any such
covenant, whether directly or indirectly, by reason of any reference elsewhere
herein to any such covenant or by reason of any reference in any such covenant
to any other provision herein or in any other document, and such omission to
comply shall not constitute a Default or an Event of Default under Section 6.01
hereof, but, except as specified above, the remainder of this Indenture and such
Notes shall be unaffected thereby. In addition, upon the Company's exercise
under Section 9.01 hereof of the option applicable to this Section 9.03, subject
to the satisfaction of the conditions set forth in Section 9.04 hereof, Sections
6.01(e), 6.01(g) and 6.01(i) hereof shall not constitute Events of Default.

Section 9.04. Conditions to Legal or Covenant Defeasance.

                  The following are the conditions precedent to the application
of either Section 9.02 or 9.03 hereof to the outstanding Notes:

                  In order to exercise either Legal Defeasance or Covenant
Defeasance:

                  (1) the Company must irrevocably deposit with the Trustee, in
         trust, for the benefit of the Holders cash in U.S. dollars,
         non-callable U.S. Government Securities, or a combination thereof, in
         such amounts as will be sufficient, in the opinion of a nationally
         recognized firm of independent public accountants selected by the
         Company, to pay the principal of, and premium, if any, and interest on,
         the Notes on the stated date for payment thereof or on the applicable
         redemption date, as the case may be;

                  (2) in the case of Legal Defeasance, the Company shall have
         delivered to the Trustee an Opinion of Counsel in the United States
         reasonably acceptable to the Trustee confirming that:

                           (a) the Company has received from, or there has been
                  published by, the Internal Revenue Service a ruling; or

                           (b) since the date of this Indenture, there has been
                  a change in the applicable federal income tax law,

         in either case to the effect that, and based thereon such Opinion of
         Counsel shall confirm that, the Holders will not recognize income, gain
         or loss for federal income tax purposes as a result of such Legal
         Defeasance and will be subject to federal income tax on the same
         amounts, in the same manner and at the same times as would have been
         the case if such Legal Defeasance had not occurred;

                                      -87-
<PAGE>

                  (3) in the case of Covenant Defeasance, the Company shall have
         delivered to the Trustee an Opinion of Counsel in the United States
         reasonably acceptable to the Trustee confirming that the Holders will
         not recognize income, gain or loss for federal income tax purposes as a
         result of such Covenant Defeasance and will be subject to federal
         income tax on the same amounts, in the same manner and at the same
         times as would have been the case if such Covenant Defeasance had not
         occurred;

                  (4) no Default or Event of Default shall have occurred and be
         continuing on the date of such deposit or insofar as Events of Default
         from bankruptcy or insolvency events are concerned, at any time in the
         period ending on the 91st day after the date of deposit (other than a
         Default or an Event of Default resulting from the borrowing of funds to
         be applied to such deposit and the grant of any Lien securing such
         borrowings);

                  (5) such Legal Defeasance or Covenant Defeasance shall not
         result in a breach or violation of, or constitute a default under this
         Indenture (other than a Default or an Event of Default resulting from
         the borrowing of funds to be applied to such deposit and the grant of
         any Lien securing such borrowings) or any other material agreement or
         instrument to which the Company or any of its Subsidiaries is a party
         or by which the Company or any of its Subsidiaries is bound;

                  (6) the Company shall have delivered to the Trustee an
         Officers' Certificate stating that the deposit was not made by the
         Company with the intent of preferring the Holders over any other
         creditors of the Company or with the intent of defeating, hindering,
         delaying or defrauding any other creditors of the Company or others;

                  (7) the Company shall have delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent provided for or relating to the Legal Defeasance
         or the Covenant Defeasance have been complied with; and

                  (8) the Company shall have delivered to the Trustee an Opinion
         of Counsel to the effect that, assuming no intervening bankruptcy of
         the Company between the date of deposit and the 91st day following the
         date of deposit and that no Holder is an insider of the Company, after
         the 91st day following the date of deposit, the trust funds will not be
         subject to the effect of any applicable bankruptcy, insolvency,
         reorganization or similar laws affecting creditors' rights generally.

                  Notwithstanding the foregoing, the Opinion of Counsel required
by clause (2) above with respect to a Legal Defeasance need not be delivered if
all Notes not theretofore delivered to the Trustee for cancellation (1) have
become due and payable or (2) will become due and payable on the maturity date
within one year under arrangements satisfactory to the

                                      -88-
<PAGE>

Trustee for the giving of notice of redemption by the Trustee in the name, and
at the expense, of the Company.

Section 9.05. Deposited Money and U.S. Government Securities to Be Held in
              Trust; Other Miscellaneous Provisions.

                  Subject to Section 9.06 hereof, all money and U.S. Government
Securities (including the proceeds thereof) deposited with the Trustee (or other
qualifying trustee, collectively for purposes of this Section 9.05 only, the
"Trustee") pursuant to Section 9.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (other than the Company) as the Trustee may determine,
to the Holders of such Notes of all sums due and to become due thereon in
respect of principal or redemption price of, and Liquidated Damages, if any,
interest on, the Notes, that such money need not be segregated from other funds
except to the extent required by law.

                  The Company shall pay and indemnify the Trustee against any
tax, fee or other charge imposed on or assessed against the cash or U.S.
Government Securities deposited pursuant to Section 9.04 hereof or the principal
and interest received in respect thereof other than any such tax, fee or other
charge which by law is for the account of the Holders of the outstanding Notes.

                  Anything in this Article 9 to the contrary notwithstanding,
the Trustee shall deliver or pay to the Company from time to time upon the
request of the Company any money or U.S. Government Securities held by it as
provided in Section 9.04 hereof which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee (which may be the opinion delivered under
Section 9.04(a) hereof), are in excess of the amount thereof that would then be
required to be deposited to effect an equivalent Legal Defeasance or Covenant
Defeasance.

Section 9.06. Repayment to the Company.

                  Any money deposited with the Trustee or any Paying Agent, or
then held by the Company, in trust for the payment of the principal, redemption
price or purchase price of, or Liquidated Damages, if any, or interest on any
Note and remaining unclaimed for two years after such amount has become due and
payable shall be paid to the Company on its request or (if then held by the
Company) shall be discharged from such trust; and the Holder of such Note shall
thereafter look only to the Company for payment thereof as a general creditor,
and all liability of the Trustee or such Paying Agent with respect to such trust
money, and all liability of the Company as trustee thereof, shall thereupon
cease; provided, however, that the Trustee or such Paying Agent, before being
required to make any such repayment, at the expense of the Company, may cause to
be published once, in The New York Times and The Wall Street Journal (national
editions), notice that such money remains unclaimed and that, after a

                                      -89-
<PAGE>

date specified therein, which shall not be less than 30 days after the date of
such notification or publication, any unclaimed balance of such money then
remaining will be repaid to the Company.

Section 9.07. Reinstatement.

                  If the Trustee or Paying Agent is unable to apply any United
States dollars or U.S. Government Securities in accordance with Section 9.02 or
9.03 hereof, as the case may be, by reason of any order of judgment of any court
or governmental authority enjoining, restraining or otherwise prohibiting such
application, then the obligations of the Company under this Indenture, and the
Notes shall be revived and reinstated as though no deposit had occurred pursuant
to Section 9.02 or 9.03 hereof until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 9.02 or 9.03
hereof, as the case may be; provided, however, that, if the Company makes any
payment with respect to any Note following the reinstatement of its obligations,
the Company shall be subrogated to the rights of the Holders of such Notes to
receive such payment from the money held by the Trustee or Paying Agent.

                                   ARTICLE 10.

                        AMENDMENT, SUPPLEMENT AND WAIVER

Section 10.01. Without Consent of Holders of Notes.

                  Notwithstanding Section 10.02 of this Indenture, the Company,
the Guarantors and the Trustee may amend or supplement this Indenture or the
Notes without the consent of any Holder of a Note:

                  (a) to cure any ambiguity, defect or inconsistency;

                  (b) to provide for uncertificated Notes in addition to or in
         place of certificated Notes;

                  (c) to provide for the assumption of the Company's obligations
         to the Holders of the Notes by a successor to the Company pursuant to
         Article 5 hereof;

                  (d) to make any change that would provide any additional
         rights or benefits to the Holders of the Notes or that does not
         adversely affect the legal rights hereunder of any Holder of the Note;
         or

                  (e) to comply with requirements of the Commission in order to
         effect or maintain the qualification of this Indenture under the TIA.

                                      -90-
<PAGE>

                  Upon the request of the Company accompanied by a resolution of
its Board of Directors authorizing the execution of any such amended or
supplemental Indenture, and upon receipt by the Trustee of the documents
described in Section 7.02 hereof, the Trustee shall join with the Company in the
execution of any amended or supplemental Indenture authorized or permitted by
the terms of this Indenture and to make any further appropriate agreements and
stipulations that may be therein contained, but the Trustee shall not be
obligated to enter into such amended or supplemental Indenture that affects its
own rights, duties or immunities under this Indenture or otherwise.

Section 10.02. With Consent of Holders of Notes.

                  (a) Except as provided below in this Section 10.02, this
Indenture and the Notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount of the Notes then outstanding
voting as a single class (including, without limitation, consents obtained in
connection with a tender offer or exchange offer for, or purchase of, the
Notes), and, subject to Sections 6.04 and 6.07 hereof, any existing Default or
Event of Default (other than a Default or Event of Default in the payment of the
principal of, premium, if any, or interest on the Notes, except a payment
default resulting solely from an acceleration that has been rescinded) or
compliance with any provision of this Indenture or the Notes may be waived with
the consent of the Holders of a majority in principal amount of the then
outstanding Notes voting as a single class (including consents obtained in
connection with a tender offer or exchange offer for, or purchase of, the
Notes). However, without the consent of each Holder affected, an amendment or
waiver under this Section 10.02 may not (with respect to any Notes held by a
non-consenting Holder):

                  (i) reduce the principal amount of Notes whose Holders must
         consent to an amendment, supplement or waiver;

                  (ii) reduce the principal of or change the fixed maturity of
         any Note or alter the provisions with respect to the redemption of the
         Notes, other than Sections 4.15 and 4.16;

                  (iii) reduce the rate of or change the time for payment of
         interest on any Note;

                  (iv) waive a Default or Event of Default in the payment of
         principal of, or interest or premium, if any, on the Notes (except a
         rescission of acceleration of the Notes by the Holders of at least a
         majority in aggregate principal amount of the Notes and a waiver of the
         payment default that resulted from such acceleration);

                  (v) make any Note payable in money other than that stated in
         the Notes;

                                      -91-
<PAGE>

                  (vi) make any change in the provisions of this Indenture
         relating to waivers of past Defaults, including Section 6.04, or the
         rights of holders of notes to receive payments of principal of, or
         interest or premium, if any, on, the Notes;

                  (vii) make any change to Section 3.09 which would adversely
         affect the rights of any of the Holders to receive the Special
         Mandatory Redemption Price;

                  (viii) waive a redemption payment with respect to any Note,
         other than a payment required under Section 4.15 or 4.16;

                  (ix) release any Guarantor from any of its obligations under
         its Subsidiary Guarantee or this Indenture, except in accordance with
         the terms of this Indenture; or

                  (x) make any change in the preceding amendment and waiver
         provisions.

                  (b) Upon the request of the Company accompanied by a
resolution of its Board of Directors authorizing the execution of any such
amended or supplemental Indenture, and upon the filing with the Trustee of
evidence satisfactory to the Trustee of the consent of the Holders of Notes as
aforesaid, and upon receipt by the Trustee of the documents described in Section
7.02 hereof, the Trustee shall join with the Company in the execution of such
amended or supplemental Indenture unless such amended or supplemental Indenture
directly affects the Trustee's own rights, duties or immunities under this
Indenture or otherwise, in which case the Trustee may in its discretion, but
shall not be obligated to, enter into such amended or supplemental Indenture.

                  (c) It shall not be necessary for the consent of the Holders
of Notes under this Section 10.02 to approve the particular form of any proposed
amendment or waiver, but it shall be sufficient if such consent approves the
substance thereof.

                  (d) After an amendment, supplement or waiver under this
Section becomes effective, the Company shall mail to the Holders of Notes
affected thereby a notice briefly describing the amendment, supplement or
waiver. Any failure of the Company to mail such notice, or any defect therein,
shall not, however, in any way impair or affect the validity of any such amended
or supplemental Indenture or waiver. Subject to Sections 6.04 and 6.07 hereof,
the Holders of a majority in aggregate principal amount of the Notes then
outstanding voting as a single class may waive compliance in a particular
instance by the Company with any provision of this Indenture or the Notes.

Section 10.03. Compliance with Trust Indenture Act.

                  Every amendment or supplement to this Indenture or the Notes
shall be set forth in an amended or supplemental Indenture that complies with
the TIA as then in effect.

                                      -92-
<PAGE>

Section 10.04. Revocation and Effect of Consents.

                  Until an amendment, supplement or waiver becomes effective, a
consent to it by a Holder of a Note is a continuing consent by the Holder of a
Note and every subsequent Holder of a Note or portion of a Note that evidences
the same debt as the consenting Holder's Note, even if notation of the consent
is not made on any Note. However, any such Holder of a Note or subsequent Holder
of a Note may revoke the consent as to its Note if the Trustee receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective. An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

Section 10.05. Notation on or Exchange of Notes.

                  The Trustee may place an appropriate notation about an
amendment, supplement or waiver on any Note thereafter authenticated. The
Company in exchange for all Notes may issue and the Trustee shall, upon receipt
of an Authentication Order, in accordance with Section 2.02 with respect to
those Notes, authenticate new Notes that reflect the amendment, supplement or
waiver.

                  Failure to make the appropriate notation or issue a new Note
shall not affect the validity and effect of such amendment, supplement or
waiver.

Section 10.06. Trustee to Sign Amendments, etc.

                  The Trustee shall sign any amended or supplemental Indenture
authorized pursuant to this Article 10 if the amendment or supplement does not
adversely affect the rights, duties, liabilities or immunities of the Trustee.
The Company may not sign an amendment or supplemental Indenture until the Board
of Directors approves it. In executing any amended or supplemental indenture,
the Trustee shall be entitled to receive and (subject to Section 7.01 hereof)
shall be fully protected in relying upon, in addition to the documents required
by Section 10.04 hereof, an Officer's Certificate and an Opinion of Counsel
stating that the execution of such amended or supplemental indenture is
authorized or permitted by this Indenture.

                                   ARTICLE 11.

                           SATISFACTION AND DISCHARGE

Section 11.01. Satisfaction and Discharge.

                  This Indenture will be discharged and will cease to be of
further effect (except as set forth below) and the Trustee, at the expense of
the Company, shall execute proper instruments acknowledging satisfaction and
discharge of this Indenture when:

                                      -93-
<PAGE>

                  (1) either:

                           (a) all the Notes theretofore authenticated and
                  delivered (except lost, stolen or destroyed notes which have
                  been replaced or paid as provided in Section 2.07 and Notes
                  for whose payment money has theretofore been deposited in
                  trust or segregated and held in trust by the Company and
                  thereafter repaid to the Company or discharged from such
                  trust) have been delivered to the Trustee for cancellation; or

                           (b) all Notes not theretofore delivered to the
                  Trustee for cancellation (1) have become due and payable or
                  (2) will become due and payable within one year, or are to be
                  called for redemption within one year, under arrangements
                  reasonably satisfactory to the Trustee for the giving of
                  notice of redemption by the Trustee in the name, and at the
                  expense, of the Company, and the Company has irrevocably
                  deposited or caused to be deposited with the Trustee funds in
                  an amount sufficient to pay and discharge the entire
                  Indebtedness on the Notes not theretofore delivered to the
                  Trustee for cancellation, for principal of, and premium, if
                  any, and interest on, the Notes to the date of deposit
                  together with irrevocable instructions from the Company
                  directing the Trustee to apply such funds to the payment
                  thereof at maturity or redemption, as the case may be;

                  (2) the Company has paid all other sums payable under this
         Indenture by the Company; and

                  (3) the Company has delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel stating that all conditions
         precedent under this Indenture relating to the satisfaction and
         discharge of this Indenture have been complied with.

                  Notwithstanding the satisfaction and discharge of this
Indenture, the Company's obligations in Sections 2.03, 2.04, 2.06, 2.07, 2.11,
7.07, 7.08, 12.02, 12.03 and 12.04, and the Trustee's and Paying Agent's
obligations in Section 11.2 shall survive until the Notes are no longer
outstanding. Thereafter, only the Company's obligations in Section 7.07 shall
survive.

Section 11.02. Application of Trust.

                  All money deposited with the Trustee pursuant to Section 11.01
shall be held in trust and, at the written direction of the Company, be invested
prior to maturity in U.S. Government Securities, and applied by the Trustee in
accordance with the provisions of the Notes and this Indenture, to the payment,
either directly or through any Paying Agent as the Trustee may determine, to the
persons entitled thereto, of the principal (and premium, if any)

                                      -94-
<PAGE>

and interest for the payment of which money has been deposited with the Trustee;
but such money need not be segregated from other funds except to the extent
required by law.

                                   ARTICLE 12.

                                  MISCELLANEOUS

Section 12.01. Trust Indenture Act Controls.

                  If any provision of this Indenture limits, qualifies or
conflicts with the duties imposed by TIA Section 318(c), the imposed duties
shall control.

Section 12.02. Notices.

                  Any notice or communication by the Company or the Trustee to
the others is duly given if in writing and delivered in person or mailed by
first class mail (registered or certified, return receipt requested), telex,
telecopier or overnight air courier guaranteeing next-day delivery, to the
others' address.

                  If to the Company:

                  Grant Prideco, Inc.
                  1330 Post Oak Boulevard, Suite 2700
                  Houston, Texas  77056
                  Attention:  Chief Financial Officer

                  With a copy to:

                  Fulbright & Jaworski L.L.P.
                  1301 McKinney, Suite 5100
                  Houston, Texas  77010-3095
                  Attention:  Charles H. Still, Esq.

                  If to the Trustee:

                  Ms. Melissa Scott
                  Wells Fargo Bank, N.A.
                  505 Main Street, Suite 301
                  Fort Worth, Texas  76102
                  Attention:  Corporate Trust Administration

                  The Company or the Trustee, by notice to the others may
designate additional or different addresses for subsequent notices or
communications.

                                      -95-
<PAGE>

                  All notices and communications (other than those sent to
Holders) shall be deemed to have been duly given: at the time delivered by hand,
if personally delivered; five Business Days after being deposited in the mail,
postage prepaid, if mailed; when answered back, if telexed; when receipt
acknowledged, if telecopied; and the next Business Day after timely delivery to
the courier, if sent by overnight air courier guaranteeing next day delivery.

                  Any notice or communication to a Holder shall be mailed by
first class mail, certified or registered, return receipt requested, or by
overnight air courier guaranteeing next day delivery to its address shown on the
register kept by the Registrar. Any notice or communication shall also be so
mailed to any person described in TIA Section 313(c), to the extent required by
the TIA. Failure to mail a notice or communication to a Holder or any defect in
it shall not affect its sufficiency with respect to other Holders.

                  Except for a notice to the Trustee, which is deemed given only
when received, and except as otherwise provided in this Indenture, if a notice
or communication is mailed in the manner provided above within the time
prescribed, it is duly given, whether or not the addressee receives it.

                  If the Company mails a notice or communication to Holders, it
shall mail a copy to the Trustee and each Agent at the same time.

                  Where this Indenture provides for notice in any manner, such
notice may be waived in writing by the person entitled to receive such notice,
either before or after the event, and such waiver shall be the equivalent of
such notice. Waivers of notice by Holders shall be filed with the Trustee, but
such filing shall not be a condition precedent to the validity of any action
taken in reliance upon such waiver.

                  In case by reason of the suspension of regular mail service or
by reason of any other cause it shall be impracticable to give such notice by
mail, then such notification as shall be made with the approval of the Trustee
shall constitute a sufficient notification for every purpose hereunder.

Section 12.03. Communication by Holders of Notes with Other Holders of Notes.

                  Holders may communicate pursuant to TIA Section 312(b) with
other Holders with respect to their rights under this Indenture or the Notes.
The Company, the Trustee, the Registrar and anyone else shall have the
protection of TIA Section 312(c).

Section 12.04. Certificate and Opinion as to Conditions Precedent.

                  Upon any request or application by the Company to the Trustee
to take any action under this Indenture, the Company shall furnish to the
Trustee:

                                      -96-
<PAGE>

                  (a) an Officers' Certificate in form and substance reasonably
         satisfactory to the Trustee (which shall include the statements set
         forth in Section 12.05 hereof) stating that, in the opinion of the
         signers, all conditions precedent and covenants, if any, provided for
         in this Indenture relating to the proposed action have been satisfied;
         and

                  (b) an Opinion of Counsel in form and substance reasonably
         satisfactory to the Trustee (which shall include the statements set
         forth in Section 12.05 hereof) stating that, in the opinion of such
         counsel, all such conditions precedent and covenants have been
         satisfied.

Section 12.05. Statements Required in Certificate or Opinion.

                  Each certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture (other than a certificate
provided pursuant to TIA Section 314(a)(4)) shall comply with the provisions of
TIA Section 314(e) and shall include:

                  (a) a statement that the person making such certificate or
         opinion has read such covenant or condition;

                  (b) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                  (c) a statement that, in the opinion of such person, he or she
         has made such examination or investigation as is necessary to enable
         him to express an informed opinion as to whether or not such covenant
         or condition has been satisfied; and

                  (d) a statement as to whether or not, in the opinion of such
         person, such condition or covenant has been satisfied.

Section 12.06. Rules by Trustee and Agents.

                  The Trustee may make reasonable rules for action by or at a
meeting of Holders. The Registrar or Paying Agent may make reasonable rules and
set reasonable requirements for its functions.

Section 12.07. No Personal Liability of Directors, Officers, Employees and
               Stockholders.

                  No recourse for the payment of the principal of, premium, if
any, or interest or Liquidated Damages, if any, on any of the Notes, or for any
claim based thereon or otherwise in respect thereof, and no recourse under or
upon any obligation, covenant or agreement of the Company or of any Guarantor
contained in this Indenture or in any of the Notes, or because of the creation
of any Indebtedness represented thereby, shall be had against any incorporator
or past, present or future director, officer, employee, controlling person or
stockholder of the

                                      -97-
<PAGE>

Company or of any Guarantor. Each Holder by accepting a Note waives and releases
all such liability. The waiver and release are part of the consideration for
issuance of the Notes. Such waiver may not be effective to waive liabilities
under the federal securities laws and it is the view of the Commission that such
a waiver is against public policy.

Section 12.08. Governing Law.

                  THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE
USED TO CONSTRUE THIS INDENTURE AND THE NOTES WITHOUT GIVING EFFECT TO
APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF
THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

Section 12.09. No Adverse Interpretation of Other Agreements.

                  This Indenture may not be used to interpret any other
indenture, loan or debt agreement of the Company or its Subsidiaries or of any
other person. Any such indenture, loan or debt agreement may not be used to
interpret this Indenture.

Section 12.10. Successors.

                  All agreements of the Company in this Indenture and the Notes
shall bind its successors. All agreements of the Trustee in this Indenture shall
bind its successors.

Section 12.11. Severability.

                  In case any provision in this Indenture or in the Notes shall
be invalid, illegal or unenforceable, the validity, legality and enforceability
of the remaining provisions shall not in any way be affected or impaired
thereby.

Section 12.12. Counterpart Originals.

                  The parties may sign any number of copies of this Indenture.
Each signed copy shall be an original, but all of them together represent the
same agreement.

Section 12.13. Table of Contents, Headings, etc.

                  The Table of Contents, Cross-Reference Table and Headings of
the Articles and Sections of this Indenture have been inserted for convenience
of reference only, are not to be considered a part of this Indenture and shall
in no way modify or restrict any of the terms or provisions hereof.

                         [Signatures on following page]

                                      -98-
<PAGE>

                                   SIGNATURES

Dated as of December 4, 2002

                             WELLS FARGO BANK, N.A., as Trustee

                             By:
                                    ------------------------------------------
                                    Name:
                                    Title:

                             GRANT PRIDECO ESCROW CORP.

                             By:
                                    ------------------------------------------
                                    Name:
                                    Title:

                                      S-1
<PAGE>

                                    EXHIBIT A
                                 (Face of Note)

                            9% Senior Notes due 2009

CUSIP [       ]

No. 144A-1                                                         $____________

                           GRANT PRIDECO ESCROW CORP.

promises to pay to Cede & Co. or registered assigns, the principal sum set forth
in the Schedule of Increases and Decreases attached to this Security on December
15, 2009.

Interest Payment Dates: June 15 and December 15, commencing June 15, 2003.

Record Dates: June 1 and December 1.

                                       GRANT PRIDECO ESCROW CORP.

                                       By:
                                              --------------------------------
                                              Name:
                                              Title:

                                       By:
                                              --------------------------------
                                              Name:
                                              Title:
This is one of the Global
Notes referred to in the
within-mentioned Indenture

WELLS FARGO BANK, N.A., as Trustee

By:
      -------------------------------------------
              Authorized Signatory

Dated: [                   ], 20[  ]

                                      A-1
<PAGE>

                                 (Back of Note)

                            9% Senior Notes due 2009

[THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO
A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A
NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR
ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY. UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.](a)

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD
WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS
EXCEPT AS SET FORTH BELOW. BY ITS ACQUISITION

----------
(a)      Used on Global Note only.

                                      A-2
<PAGE>

HEREOF, THE HOLDER (1) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL
BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS NOT A
U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION IN COMPLIANCE
WITH RULE 904 UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT WITHIN TWO
YEARS AFTER THE ORIGINAL ISSUANCE OF THIS NOTE RESELL OR OTHERWISE TRANSFER THIS
NOTE EXCEPT (A) TO GRANT PRIDECO, INC. OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE
UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A
UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN ACCREDITED INVESTOR
(AS DEFINED IN RULE 501(a)(1), (2), (3), OR (7) UNDER THE SECURITIES ACT (AN
"ACCREDITED INVESTOR")) THAT, PRIOR TO SUCH TRANSFER, FURNISHES (OR HAS
FURNISHED ON ITS BEHALF BY A U.S. BROKER-DEALER) TO THE TRUSTEE A SIGNED LETTER
CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS
ON TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE
TRUSTEE FOR THIS NOTE), (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION
IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT (IF AVAILABLE), (E)
PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE
SECURITIES ACT (IF AVAILABLE), (F) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF
COUNSEL IF GRANT PRIDECO, INC. SO REQUESTS), OR (G) PURSUANT TO AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE
TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE
EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS NOTE WITHIN TWO
YEARS AFTER THE ORIGINAL ISSUANCE OF THIS NOTE, IF THE PROPOSED TRANSFEREE IS AN
ACCREDITED INVESTOR, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE
TRUSTEE AND GRANT PRIDECO, INC. SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER
INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH
TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT
SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN,
THE TERMS "OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE THE
MEANING GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

                  Capitalized terms used herein shall have the meanings assigned
to them in the Indenture referred to below unless otherwise indicated.

                  1. INTEREST. Grant Prideco Escrow Corp., a Delaware
corporation (the "Company"), promises to pay interest on the principal amount of
this Note at 9% per annum until maturity and shall pay the Liquidated Damages,
if any, payable pursuant to Section 4 of

                                      A-3
<PAGE>

the Registration Rights Agreement referred to below. The Company shall pay
interest and Liquidated Damages, if any, semi-annually on June 15 and December
15 of each year, or if any such day is not a Business Day, on the next
succeeding Business Day (each, an "Interest Payment Date"). Interest on the
Notes shall accrue from the most recent date to which interest has been paid or,
if no interest has been paid, from and including [ ], [ ]; provided, however,
that if there is no existing Default in the payment of interest, and if this
Note is authenticated between a record date referred to on the face hereof and
the next succeeding Interest Payment Date, interest shall accrue from such next
succeeding Interest Payment Date; provided, further, that the first Interest
Payment Date shall be [ ], [ ]. The Company shall pay interest (including
post-petition interest in any proceeding under any Bankruptcy Law) on overdue
principal and premium, if any, from time to time on demand at a rate that is 1%
per annum in excess of the rate then in effect; it shall pay interest (including
post-petition interest in any, proceeding under any Bankruptcy Law) on overdue
installments of interest and Liquidated Damages, if any (without regard to any
applicable grace periods) from time to time on demand at the same rate to the
extent lawful. Interest shall be computed on the basis of a 360-day year of
twelve 30-day months.

                  2. METHOD OF PAYMENT. The Company shall pay principal,
premium, if any, interest and Liquidated Damages, if any, on the Notes to the
persons who are registered Holders of Notes at the close of business on the June
1 or December 1 next preceding the interest payment date, even if such Notes are
cancelled after such record date and on or before such interest payment date,
except as provided in Section 2.12 of the Indenture with respect to defaulted
interest. The Notes shall be payable by wire transfer of immediately available
funds to the registered Holder of the relevant Global Note and, with respect to
certificated Notes, by wire transfer of immediately available funds in
accordance with instructions provided by the registered holders of certificated
Notes or, if no such instructions are specified, by mailing a check to each such
Holder's registered address. Such payment shall be in such coin or currency of
the United States of America as at the time of payment is legal tender for
payment of public and private debts.

                  3. PAYING AGENT AND REGISTRAR. Initially, Wells Fargo Bank,
N.A., the Trustee under the Indenture, shall act as Paying Agent and Registrar.
The Company may change any Paying Agent or Registrar without notice to any
Holder. The Company or any of its Subsidiaries may act in any such capacity.

                  4. INDENTURE. The Company issued the Notes under an Indenture
dated as of December 4, 2002 ("Indenture") between the Company and the Trustee.
The terms of the Notes include those stated in the Indenture and those made part
of the Indenture by reference to the Trust Indenture Act of 1939, as amended (15
U.S. Code Sections 77aaa-77bbbb). The Notes are subject to all such terms, and
Holders are referred to the Indenture and such Act for a statement of such
terms. To the extent any provision of this Note conflicts with the express
provisions of the Indenture, the provisions of the Indenture shall govern and be
controlling.

                                      A-4
<PAGE>

The Company may issue Additional Notes under the Indenture subject to compliance
with Section 4.09 thereof, unlimited in aggregate principal amount.

                  5. OPTIONAL REDEMPTION. The Company may redeem any or all of
the Notes at any time on or after December 15, 2006, upon not less than 30 nor
more than 60 days' prior notice in amounts of $1,000 or an integral multiple
thereof at the redemption prices (expressed as a percentage of the principal
amount) set forth below, if redeemed during the 12-month period beginning
December 15 of the years indicated below:

<Table>
<Caption>
                  Year                                                         Redemption Price
                  ----                                                         ----------------
<S>                                                                            <C>
                  2006..............................................                104.500%
                  2007..............................................                102.250%
                  2008 and thereafter...............................                100.000%
</Table>

in each case together with accrued and unpaid interest and Liquidated Damages,
if any, to the date of redemption.

                  If less than all the Notes are to be redeemed, the Trustee
will select the particular Notes or portions thereof to be redeemed or purchased
among the Holders of the Notes in compliance with the requirements of the
principal national securities exchange, if any, on which the Notes are listed
or, if the Notes are not so listed, on a pro rata basis, by lot or in accordance
with any other method the Trustee considers fair and appropriate.

                  6. OPTIONAL REDEMPTION UPON EQUITY OFFERING. Following the
Acquisition Closing Date, from time to time, on or prior to December 15, 2005,
the Company may, at its option, use the net cash proceeds of one or more Equity
Offerings to redeem up to 35% of the aggregate principal amount of the Notes
issued under the Indenture at a redemption price equal to 109% of the principal
amount thereof, plus accrued and unpaid interest thereon, if any, and Liquidated
Damages, if any, to the date of redemption; provided that (a) at least 65% of
the original principal amount of Notes issued under the Indenture shall remain
outstanding immediately after any such redemption, and (b) the Company shall
make such redemption not more than 90 days after the consummation of any such
Equity Offering. If a partial redemption is made with the proceeds of an Equity
Offering, selection of the Notes or portions thereof for redemption shall be
made by the Trustee only on a pro rata basis or on as nearly a pro rata basis as
is practicable (subject to the procedures of the Depository), unless such method
is prohibited.

                  As used in the preceding paragraph, "Equity Offering" means
any public or private sale of the Company's Equity Interests (other than
Disqualified Stock.)

                  7. SPECIAL MANDATORY REDEMPTION. In the event that (a) the
Acquisition and the Grant Prideco Assumption are not consummated on or prior to
February 28, 2003

                                      A-5
<PAGE>

(the "Deadline Date") or (b) the Acquisition Agreement is terminated on or prior
to the Deadline Date for any reason, the Company shall redeem all the
outstanding Notes at a redemption price equal to 101% of the initial offering
price of the Notes plus accrued and unpaid interest to the Special Mandatory
Redemption Date(a).

                  8. MANDATORY REDEMPTION. Except as set forth in paragraphs 7
and 9 below, the Company shall not be required to make mandatory redemption
payments with respect to the Notes.

                  9. REPURCHASE AT OPTION OF HOLDER.

                  (a) Upon the occurrence of a Change of Control Triggering
Event, each Holder shall have the right to require the Company to make an offer
(a "Change of Control Offer") to each Holder to repurchase all or any part,
equal to $1,000 or an integral multiple of $1,000, of the Holder's Notes at an
offer price in cash equal to 101% of the aggregate principal amount of Notes
repurchased, plus accrued and unpaid interest and Liquidated Damages, if any, on
Notes repurchased to the date fixed for repurchase (the "Change of Control
Payment").

                  (b) If the Company or a Restricted Subsidiary consummates any
Asset Sales, when the aggregate amount of Excess Proceeds exceeds $10.0 million
in any calendar year, the Company shall make a pro rata offer to purchase (an
"Asset Sale Offer") to all Holders of Notes and all holders of other
Indebtedness that is pari passu with the Notes containing provisions similar to
those set forth in the Indenture with respect to offers to purchase or redeem
with the proceeds of sales of assets to purchase the maximum principal amount of
Notes and such other pari passu Indebtedness that may be purchased out of the
Excess Proceeds. The offer price in any Asset Sale Offer will be equal to 100%
of principal amount plus accrued and unpaid interest to the date of purchase,
and will be payable in cash. If any Excess Proceeds remain after consummation of
an Asset Sale Offer, the Company may use those Excess Proceeds for any purpose
not otherwise prohibited by the Indenture. If the aggregate principal amount of
Notes and other pari passu Indebtedness tendered into such Asset Sale Offer
exceeds the amount of Excess Proceeds, the Trustee shall select the Notes and
such other pari passu Indebtedness to be purchased on a pro rata basis. Upon
completion of each Asset Sale Offer, the amount of Excess Proceeds will be
deemed to have been reset at zero.

----------
(a)      Only applicable to Initial Notes issued on the Issue Date.

                                      A-6
<PAGE>

                  10. NOTICE OF REDEMPTION. Other than pursuant to paragraph 7
above, notice of redemption shall be mailed at least 30 days but not more than
60 days before the redemption date to each Holder whose Notes are to be redeemed
at its registered address. Notes and portions of Notes selected shall be in
amounts of $1,000 or whole multiples of $1,000; except that if all of the Notes
of a Holder are to be redeemed, the entire outstanding amount of Notes held by
such Holder, even if not a multiple of $1,000, shall be redeemed. On and after
the redemption date interest ceases to accrue on Notes, or portions thereof
called for redemption.

                  11. DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in
registered form without coupons in denominations of $1,000 and integral
multiples of $1,000. The transfer of Notes may be registered and Notes may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and
fees required by law or permitted by the Indenture. The Company need not
exchange or register the transfer of any Note or portion of a Note selected for
redemption, except for the unredeemed portion of any Note being redeemed in
part. Also, the Company need not exchange or register the transfer of any Notes
for a period of 15 days before a selection of Notes to be redeemed or during the
period between a record date and the corresponding interest payment date.

                  12. PERSONS DEEMED OWNERS. The registered Holder of a Note may
be treated as its owner for all purposes.

                  13. AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain
exceptions, the Indenture or the Notes may be amended or supplemented with the
consent of the Holders of at least a majority in principal amount of the then
outstanding Notes voting as a single class, and any existing default or
compliance with any provision of the Indenture or the Notes may be waived with
the consent of the Holders of a majority in principal amount of the then
outstanding Notes voting as a single class. Without the consent of any Holder of
a Note, the Indenture or the Notes may be amended or supplemented to cure any
ambiguity, defect or inconsistency, to provide for uncertificated Notes in
addition to or in place of certificated Notes, to provide for the assumption of
the Company's obligations to Holders of the Notes in case of a merger or
consolidation, or sale of substantially all of the Company's assets, to make any
change that would provide any additional rights or benefits to the Holders of
the Notes or that does not adversely affect the legal rights under the Indenture
of any such Holder, or to comply with the requirements of the Commission in
order to effect or maintain the qualification of the Indenture under the Trust
Indenture Act.

                  14. DEFAULTS AND REMEDIES. Events of Default include, in
summary form: (a) default in the payment when due of principal of or premium, if
any, on any Note when the same becomes due and payable at maturity, upon
acceleration, redemption or otherwise; (b) default in the payment when due of
interest on, or Liquidated Damages with respect to, any

                                      A-7
<PAGE>

Note, and such default continues for a period of 30 days; (c) default in the
performance or breach of the provisions by the Company or any of its Restricted
Subsidiaries of 3.09, 4.07, 4.09 or Section 5.01 of the Indenture; (d) default
in the performance by the Company or any of its Restricted Subsidiaries of
Sections 4.15 or 4.16 of the Indenture, and such default continues for a period
of 30 days after written notice; (e) default in the performance of or breaches
any other covenant or agreement of the Company in the Indenture or under the
Notes (other than a default specified in clause (a), (b), (c) or (d) above) by
the Company or any of its Restricted Subsidiaries and such default or breach
continues for a period of 60 days after written notice by the Trustee to the
Company or by the Holders of 25% or more in aggregate principal amount of the
Notes to the Company and the Trustee; (f) certain defaults under any mortgage,
indenture or instrument under which there may be issued or by which there may be
secured or evidenced any Indebtedness for money borrowed by the Company or any
of its Restricted Subsidiaries (or the payment of which is guaranteed by the
Company or any of its Restricted Subsidiaries) whether such Indebtedness or
guarantee now exists, or is created after the date of the Indenture; (g) default
by the Company or any of its Subsidiaries in the payment of final judgments
aggregating in excess of $10.0 million, which judgments are not paid, discharged
or stayed for a period of 60 days; (h) except as permitted by the Indenture, any
Subsidiary Guarantee shall be held in any judicial proceeding to be
unenforceable or invalid or shall cease for any reason to be in full force and
effect or any Guarantor, or any person acting on behalf of any Guarantor, shall
deny or disaffirm its obligations under its Subsidiary Guarantee; and (i)
certain events of bankruptcy or insolvency with respect to the Company or any of
its Restricted Subsidiaries. If any Event of Default occurs and is continuing,
the Trustee or the Holders of at least 25% in principal amount of the then
outstanding Notes may declare all the Notes to be due and payable, subject to
certain conditions. Notwithstanding the foregoing, in the case of an Event of
Default arising from certain events of bankruptcy or insolvency, all outstanding
Notes shall become due and payable without further action or notice. Holders may
not enforce the Indenture or the Notes except as provided in the Indenture.
Subject to certain limitations, Holders of a majority in aggregate principal
amount of the then outstanding Notes may direct the Trustee in its exercise of
any trust or power. The Trustee may withhold from Holders of the Notes notice of
any continuing Default or Event of Default (except a Default or Event of Default
relating to the payment of principal or interest) if it determines that
withholding notice is in their interest. The Holders of a majority in aggregate
principal amount of the Notes then outstanding by notice to the Trustee may on
behalf of the Holders of all of the Notes waive any existing Default or Event of
Default and its consequences under the Indenture except a continuing Default or
Event of Default in the payment of interest and premium, if any, on, or the
principal of, the Notes. The Company is required to deliver to the Trustee
annually a statement regarding compliance with the Indenture, and the Company is
required upon becoming aware of any Default or Event of Default, to deliver to
the Trustee a statement specifying such Default or Event of Default.

                  15. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its
individual or any other capacity, may make loans to, accept deposits from, and
perform services for the

                                      A-8
<PAGE>

Company or its Affiliates, and may otherwise deal with the Company or its
Affiliates, as if it were not the Trustee.

                  16. NO RECOURSE AGAINST OTHERS. No recourse for the payment of
the principal of, premium, if any, or interest or Liquidated Damages, if any, on
any of the Notes, or for any claim based thereon or otherwise in respect
thereof, and no recourse under or upon any obligation, covenant or agreement of
the Company contained in the Indenture or in any of the Notes, or because of the
creation of any Indebtedness represented thereby, shall be had against any
incorporator or past, present or future director, officer, employee, controlling
person or stockholder of the Company. Each Holder by accepting a Note waives and
releases all such liability. The waiver and release are part of the
consideration for the issuance of the Notes.

                  17. AUTHENTICATION. This Note shall not be valid until
authenticated by the manual signature of the Trustee or an authenticating agent.

                  18. ABBREVIATIONS. Customary abbreviations may be used in the
name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT
(= tenants by the entireties), JT TEN (= joint tenants with right of
survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (=
Uniform Gifts to Minors Act).

                  19. ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES
AND RESTRICTED DEFINITIVE NOTES. In addition to the rights provided to Holders
of Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the Registration Rights
Agreement dated as of [ ], [ ], between the parties named on the signature pages
thereof, as such agreement may be amended, modified or supplemented from time to
time (the "Registration Rights Agreement").

                  20. CUSIP NUMBERS. Pursuant to a recommendation promulgated by
the Committee on Uniform Security Identification Procedures, the Company has
caused CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP
numbers in notices of redemption as a convenience to Holders. No representation
is made as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

                  The Company shall furnish to any Holder upon written request
and without charge a copy of the Indenture and/or the Registration Rights
Agreement. Requests may be made to:

                  Grant Prideco, Inc.
                  1330 Post Oak Boulevard, Suite 2700
                  Houston, Texas  77056
                  Attention: Chief Financial Officer

                                      A-9
<PAGE>

                                 ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to

--------------------------------------------------------------------------------
               (Insert assignee's social security or tax I.D. no.)

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
              (Print or type assignee's name, address and zip code)

and irrevocably appoint
                        --------------------------------------------------------
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.

--------------------------------------------------------------------------------

Date:
      -------------------
                               Your Signature:
                                              ----------------------------------

                               (Sign exactly as your name appears on the face
                               of this Note)

                               Signature Guarantee:
                                                   -----------------------------

                                      A-10
<PAGE>

                       OPTION OF HOLDER TO ELECT PURCHASE

                  If you want to elect to have this Note purchased by the
Company pursuant to Section 4.15 or 4.16 of the Indenture, check the box below:

              Section 4.15                      Section 4.16

                  If you want to elect to have only part of the Note purchased
by the Company pursuant to Section 4.15 or Section 4.16 of the Indenture, state
the amount you elect to have purchased: $________

Date:
      -------------------
                               Your Signature:
                                              ----------------------------------

                               (Sign exactly as your name appears on the face
                               of this Note)

                               Signature Guarantee:
                                                   -----------------------------

                               Tax Identification No.:
                                                      --------------------------

                                      A-11
<PAGE>

              SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE

                  The initial principal amount of this Global Note is [ ]
Million Dollars ($[ ]). The following exchanges of a part of this Global Note
for an interest in another Global Note or for a Definitive Note, or exchanges of
a part of another Global Note or Definitive Note for an interest in this Global
Note, resulting in increases or decreases of the principal amount of this Global
Note, have been made:

<Table>
<Caption>
                                                                                                  Signature of
                              Amount of              Amount of          Principal Amount of        authorized
                             decrease in            increase in          this Global Note          officer of
       Date of           Principal Amount of    Principal Amount of   following such decrease      Trustee or
       Exchange           this Global Note        this Global Note         (or increase)            Custodian
-----------------------------------------------------------------------------------------------------------------
<S>                      <C>                    <C>                   <C>                        <C>

</Table>

                                      A-12
<PAGE>

                                    EXHIBIT B

                         FORM OF CERTIFICATE OF TRANSFER

Grant Prideco, Inc.
1330 Post Oak Boulevard, Suite 2700
Houston, Texas  77056

Wells Fargo Bank, N.A.
505 Main Street, Suite 301
Forth Worth, Texas  76102

                  Re:      9% SENIOR NOTES DUE 2009 OF GRANT PRIDECO ESCROW
                           CORP.

                  Reference is hereby made to the Indenture, dated as of
December 4, 2002 (the "Indenture"), between Grant Prideco Escrow Corp., as
issuer (the "Company"), and Wells Fargo Bank, N.A., as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

                  ______________ (the "Transferor") owns and proposes to
transfer the Note[s] or interest in such Note[s] specified in Annex A hereto, in
the principal amount of $___________ in such Note[s] or interests (the
"Transfer"), to __________ (the "Transferee"), as further specified in Annex A
hereto. In connection with the Transfer, the Transferor hereby certifies that:

                             [CHECK ALL THAT APPLY]

1. CHECK IF TRANSFEREE SHALL TAKE DELIVERY OF A BENEFICIAL INTEREST IN THE 144A
GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO RULE 144A. The Transfer is being
effected pursuant to and in accordance with Rule 144A under the United States
Securities Act of 1933 (the "Securities Act"), and, accordingly, the Transferor
hereby further certifies that the beneficial interest or Definitive Note is
being transferred to a person that the Transferor reasonably believed and
believes is purchasing the beneficial interest or Definitive Note for its own
account, or for one or more accounts with respect to which such person exercises
sole investment discretion, and such person and each such account is a
"qualified institutional buyer" within the meaning of Rule 144A in a transaction
meeting the requirements of Rule 144A and such Transfer is in compliance with
any applicable blue sky securities laws of any state of the United States. Upon
consummation of the proposed Transfer in accordance with the terms of the
Indenture, the transferred beneficial interest or Definitive Note shall be
subject to the restrictions on transfer enumerated in the Private Placement
Legend printed on the 144A Global Note or the Definitive Note and in the
Indenture and the Securities Act.

                                      B-1
<PAGE>

2. CHECK IF TRANSFEREE SHALL TAKE DELIVERY OF A BENEFICIAL INTEREST IN THE
REGULATION S GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO REGULATION S. The
Transfer is being effected pursuant to and in accordance with Rule 904 under the
Securities Act and, accordingly, the Transferor hereby further certifies that
(i) the Transfer is not being made to a person in the United States and (x) at
the time the buy order was originated, the Transferee was outside the United
States or such Transferor and any person acting on its behalf reasonably
believed and believes that the Transferee was outside the United States or (y)
the transaction was executed in, on or through the facilities of a designated
offshore securities market and neither such Transferor nor any person acting on
its behalf knows that the transaction was prearranged with a buyer in the United
States, (ii) no directed selling efforts have been made in contravention of the
requirements of Rule 904(b) of Regulation S under the Securities Act, (iii) the
transaction is not part of a plan or scheme to evade the registration
requirements of the Securities Act and (iv) if the proposed transfer is being
made prior to the expiration of the Restricted Period, the transfer is not being
made to a U.S. person or for the account or benefit of a U.S. person (other than
an Initial Purchaser). Upon consummation of the proposed transfer in accordance
with the terms of the Indenture, the transferred beneficial interest or
Definitive Note shall be subject to the restrictions on Transfer enumerated in
the Private Placement Legend printed on the Regulation S Global Note and/or the
Definitive Note and in the Indenture and the Securities Act.

3. CHECK AND COMPLETE IF TRANSFEREE SHALL TAKE DELIVERY OF A BENEFICIAL INTEREST
IN A DEFINITIVE NOTE PURSUANT TO ANY PROVISION OF THE SECURITIES ACT OTHER THAN
RULE 144A OR REGULATION S. The Transfer is being effected in compliance with the
transfer restrictions applicable to beneficial interests in Restricted Global
Notes and Restricted Definitive Notes and pursuant to and in accordance with the
Securities Act and any applicable blue sky securities laws of any state of the
United States, and accordingly the Transferor hereby further certifies that
(check one):

                  (a) such Transfer is being effected pursuant to and in
         accordance with Rule 144 under the Securities Act;

                                       or

                  (b) such Transfer is being effected to the Company or a
         subsidiary thereof;

                                       or

                  (c) such Transfer is being effected pursuant to an effective
         registration statement under the Securities Act and in compliance with
         the prospectus delivery requirements of the Securities Act;

                                      B-2
<PAGE>

                                       or

                  (d) such Transfer is being effected to an Institutional
         Accredited Investor and pursuant to an exemption from the registration
         requirements of the Securities Act other than Rule 144A, Rule 144 or
         Rule 904, and the Transferor hereby further certifies that it has not
         engaged in any general solicitation within the meaning of Regulation D
         under the Securities Act and the Transfer complies with the transfer
         restrictions applicable to beneficial interests in a Restricted Global
         Note or Restricted Definitive Notes and the requirements of the
         exemption claimed, which certification is supported by (1) a
         certificate executed by the Transferee in the form of Exhibit D to the
         Indenture, and (2) an Opinion of Counsel provided by the Transferor or
         the Transferee (a copy of which the Transferor has attached to this
         certification), to the effect that such Transfer is in compliance with
         the Securities Act. Upon consummation of the proposed transfer in
         accordance with the terms of the Indenture, the transferred beneficial
         interest or Definitive Note shall be subject to the restrictions on
         transfer enumerated in the Private Placement Legend printed on the
         Definitive Notes and in the Indenture and the Securities Act.

5. CHECK IF TRANSFEREE SHALL TAKE DELIVERY OF A BENEFICIAL INTEREST IN AN
UNRESTRICTED GLOBAL NOTE OR OF AN UNRESTRICTED DEFINITIVE NOTE.

                  (a) CHECK IF TRANSFER IS PURSUANT TO RULE 144. (i) The
         Transfer is being effected pursuant to and in accordance with Rule 144
         under the Securities Act and in compliance with the transfer
         restrictions contained in the Indenture and any applicable blue sky
         securities laws of any state of the United States and (ii) the
         restrictions on transfer contained in the Indenture and the Private
         Placement Legend are not required in order to maintain compliance with
         the Securities Act. Upon consummation of the proposed Transfer in
         accordance with the terms of the Indenture, the transferred beneficial
         interest or Definitive Note shall no longer be subject to the
         restrictions on transfer enumerated in the Private Placement Legend
         printed on the Restricted Global Notes, on Restricted Definitive Notes
         and in the Indenture.

                  (b) CHECK IF TRANSFER IS PURSUANT TO REGULATION S. (i) The
         Transfer is being effectED pursuant to and in accordance with Rule 903
         or Rule 904 under the Securities Act and in compliance with the
         transfer restrictions contained in the Indenture and any applicable
         blue sky securities laws of any state of the United States and (ii) the
         restrictions on transfer contained in the Indenture and the Private
         Placement Legend are not required in order to maintain compliance with
         the Securities Act. Upon consummation of the proposed Transfer in
         accordance with the terms of the Indenture, the transferred beneficial
         interest or Definitive Note shall no longer be subject to the
         restrictions on transfer enumerated in the Private Placement Legend
         printed on the Restricted Global Notes, on Restricted Definitive Notes
         and in the Indenture.

                                      B-3
<PAGE>

                  (c) CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION. (i) The
         Transfer is being effected pursuant to and in compliance with an
         exemption from the registration requirements of the Securities Act
         other than Rule 144, Rule 903 or Rule 904 and in compliance with the
         transfer restrictions contained in the Indenture and any applicable
         blue sky securities laws of any State of the United States and (ii) the
         restrictions on transfer contained in the Indenture and the Private
         Placement Legend are not required in order to maintain compliance with
         the Securities Act. Upon consummation of the proposed Transfer in
         accordance with the terms of the Indenture, the transferred beneficial
         interest or Definitive Note shall not be subject to the restrictions on
         transfer enumerated in the Private Placement Legend printed on the
         Restricted Global Notes or Restricted Definitive Notes and in the
         Indenture.

                  This certificate and the statements contained herein are made
for your benefit and the benefit of the Company.

                                     -----------------------------------------
                                     [Insert Name of Transferor]

                                     By:
                                            ----------------------------------
                                            Name:
                                            Title:
Dated:              ,
      --------------  ----

                       ANNEX A TO CERTIFICATE OF TRANSFER

1.       The Transferor owns and proposes to transfer the following:

                                   [CHECK ONE]

         (a)      a beneficial interest in the:

                  (i)      144A Global Note (CUSIP _________), or

                  (ii)     Regulation S Global Note (CUSIP _________), or

         (b)      a Restricted Definitive Note.

2.       After the Transfer the Transferee shall hold:

                                   [CHECK ONE]

         (a)      a beneficial interest in the:

                  (i)      144A Global Note (CUSIP _________), or

                                      B-4
<PAGE>

                  (ii)     Regulation S Global Note (CUSIP _________), or

                  (iii)    Unrestricted Global Note (CUSIP _________); or

         (b)      a Restricted Definitive Note; or

         (c)      Unrestricted Definitive Note,

         in accordance with the terms of the Indenture.

                                      B-5
<PAGE>

                                    EXHIBIT C

                         FORM OF CERTIFICATE OF EXCHANGE

Grant Prideco, Inc.
1330 Post Oak Boulevard, Suite 2700
Houston, Texas  77056

Wells Fargo Bank, N.A.
505 Main Street, Suite 301
Forth Worth, Texas  76102

                  Re:      9% SENIOR NOTES DUE 2009 OF GRANT PRIDECO ESCROW
                           CORP.

                              (CUSIP______________)

                  Reference is hereby made to the Indenture, dated as of
December 4, 2002 (the "Indenture"), between Grant Prideco Escrow Corp., as
issuer (the "Company"), and Wells Fargo Bank, N.A., as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

                  ____________ (the "Owner") owns and proposes to exchange the
Note[s] or interest in such Note[s] specified herein, in the principal amount of
$____________ in such Note[s] or interests (the "Exchange"). In connection with
the Exchange, the Owner hereby certifies that:

1. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN A
RESTRICTED GLOBAL NOTE FOR UNRESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
IN AN UNRESTRICTED GLOBAL NOTE

                  (a) CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A
RESTRICTED GLOBAL NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In
connection with the Exchange of the Owner's beneficial interest in a Restricted
Global Note for a beneficial interest in an Unrestricted Global Note in an equal
principal amount, the Owner hereby certifies (i) the beneficial interest is
being acquired for the Owner's own account without transfer, (ii) such Exchange
has been effected in compliance with the transfer restrictions applicable to the
Global Notes and pursuant to and in accordance with the United States Securities
Act of 1933 (the "Securities Act"), (iii) the restrictions on transfer contained
in the Indenture and the Private Placement Legend are not required in order to
maintain compliance with the Securities Act and (iv) the beneficial interest in
an Unrestricted Global Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

                                      C-1
<PAGE>

                  (b) CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A
RESTRICTED GLOBAL NOTE TO UNRESTRICTED DEFINITIVE NOTE. In connection with the
Exchange of the Owner's beneficial interest in a Restricted Global Note for an
Unrestricted Definitive Note, the Owner hereby certifies (i) the Definitive Note
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the Definitive Note is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

                  (c) CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In connection with the
Owner's Exchange of a Restricted Definitive Note for a beneficial interest in an
Unrestricted Global Note, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to Restricted Definitive Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

                  (d) CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
UNRESTRICTED DEFINITIVE NOTE. In connection with the Owner's Exchange of a
Restricted Definitive Note for an Unrestricted Definitive Note, the Owner hereby
certifies (i) the Unrestricted Definitive Note is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

2. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN RESTRICTED
GLOBAL NOTES FOR RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN
RESTRICTED GLOBAL NOTES

                  (a) CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A
RESTRICTED GLOBAL NOTE TO RESTRICTED DEFINITIVE NOTE. In connection with the
Exchange of the Owner's beneficial interest in a Restricted Global Note for a
Restricted Definitive Note with an equal principal amount, the Owner hereby
certifies that the Restricted Definitive Note is being

                                      C-2
<PAGE>

acquired for the Owner's own account without transfer. Upon consummation of the
proposed Exchange in accordance with the terms of the Indenture, the Restricted
Definitive Note issued shall continue to be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the Restricted
Definitive Note and in the Indenture and the Securities Act.

                  (b) CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
BENEFICIAL INTEREST IN A RESTRICTED GLOBAL NOTE. In connection with the Exchange
of the Owner's Restricted Definitive Note for a beneficial interest in the
[CHECK ONE]

                       144A Global Note,

                       Regulation S Global Note,

with an equal principal amount, the Owner hereby certifies (i) the beneficial
interest is being acquired for the Owner's own account without transfer and (ii)
such Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes and pursuant to and in accordance with
the Securities Act, and in compliance with any applicable blue sky securities
laws of any state of the United States. Upon consummation of the proposed
Exchange in accordance with the terms of the Indenture, the beneficial interest
issued shall be subject to the restrictions on transfer enumerated in the
Private Placement Legend printed on the relevant Restricted Global Note and in
the Indenture and the Securities Act.

                  This certificate and the statements contained herein are made
for your benefit and the benefit of the Company.

                                     -----------------------------------------
                                     [Insert Name of Owner]

                                     By:
                                            ----------------------------------
                                            Name:
                                            Title:
Dated:              ,
      --------------  ----

                                      C-3
<PAGE>

                                    EXHIBIT D

                            FORM OF CERTIFICATE FROM
                   ACQUIRING INSTITUTIONAL ACCREDITED INVESTOR

Grant Prideco, Inc.
1330 Post Oak Boulevard, Suite 2700
Houston, Texas  77056

Wells Fargo Bank, N.A.
505 Main Street, Suite 301
Forth Worth, Texas  76102

                  Re:      9% SENIOR NOTES DUE 2009

                  Reference is hereby made to the Indenture, dated as of
December 4, 2002 (the "Indenture"), by and between Grant Prideco Escrow Corp. as
issuer (the "Company"), and Wells Fargo Bank, N.A., as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

                  In connection with our proposed purchase of $____________
aggregate principal amount of:

                  (a) a beneficial interest in a Global Note, or

                  (b) a Definitive Note,

we confirm that:

                  1. We understand that any subsequent transfer of the Notes or
any interest therein is subject to certain restrictions and conditions set forth
in the Indenture and the undersigned agrees to be bound by, and not to resell,
pledge or otherwise transfer the Notes or any interest therein except in
compliance with, such restrictions and conditions and the United States
Securities Act of 1933, as amended (the "Securities Act").

                  2. We understand that the offer and sale of the Notes have not
been registered under the Securities Act, and that the Notes and any interest
therein may not be offered or sold except as permitted in the following
sentence. We agree, on our own behalf and on behalf of any accounts for which we
are acting as hereinafter stated, that if we should sell the Notes or any
interest therein, we will do so only (A) to the Company or any subsidiary
thereof, (B) in accordance with Rule 144A under the Securities Act to a
"qualified institutional buyer" (as defined therein), (C) to an institutional
"accredited investor" (as defined below) that, prior

                                      D-1
<PAGE>

to such transfer, furnishes (or has furnished on its behalf by a U.S.
broker-dealer) to you and to the Company a signed letter substantially in the
form of this letter, (D) outside the United States in accordance with Rule 904
of Regulation S under the Securities Act, (E) pursuant to the provisions of Rule
144(k) under the Securities Act or (F) pursuant to an effective registration
statement under the Securities Act, and we further agree to provide to any
person purchasing the Definitive Note or beneficial interest in a Global Note
from the Company in a transaction meeting the requirements of clauses (A)
through (E) of this paragraph a notice advising such purchaser that resales
thereof are restricted as stated herein.

                  3. We understand that, on any proposed resale of the Notes or
beneficial interest therein, we will be required to furnish to you and the
Company such certifications, legal opinions and other information as you and the
Company may reasonably require to confirm that the proposed sale complies with
the foregoing restrictions. We further understand that the Notes purchased by
the Company will bear a legend to the foregoing effect.

                  4. We are an institutional "accredited investor" (as defined
in Rule 501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and
have such knowledge and experience in financial and business matters as to be
capable of evaluating the merits and risks of our investment in the Notes, and
we and any accounts for which we are acting are each able to bear the economic
risk of our or its investment.

                  5. We are acquiring the Notes or beneficial interest therein
purchased by the Company for our own account or for one or more accounts (each
of which is an institutional "accredited investor") as to each of which we
exercise sole investment discretion.

                  You and the Company are entitled to rely upon this letter and
are irrevocably authorized to produce this letter or a copy hereof to any
interested party in any administrative or legal proceedings or official inquiry
with respect to the matters covered hereby.

                                     -----------------------------------------
                                     [Insert Name of Accredited Investor]

                                     By:
                                            ----------------------------------
                                            Name:
                                            Title:
Dated:              ,
      --------------  ----

                                      D-2
<PAGE>

                                    EXHIBIT E

                                    GUARANTEE

                  For value received, [each of] the undersigned hereby
unconditionally guarantees, as principal obligor and not only as a surety, to
the Holder of this Note the cash payments in United States dollars of principal
of, and premium, if any, and interest on, this Note (and including Liquidated
Damages payable thereon) in the amounts and at the times when due and interest
on the overdue principal, premium, if any, and interest, if any, of this Note,
if lawful, and the payment or performance of all other Obligations of the
Company under the Indenture (as defined below) or the Note, to the Holder of
this Note and the Trustee, all in accordance with and subject to the terms and
limitations of this Note, Article 8 of the Indenture and this Guarantee. This
Guarantee will become effective in accordance with Article 8 of the Indenture
and its terms shall be evidenced therein. The validity and enforceability of
this Guarantee shall not be affected by the fact that it is not affixed to any
particular Note. Capitalized terms used but not defined herein shall have the
meanings ascribed to them in the Indenture dated as of December 4, 2002, among
Grant Prideco, Inc., a Delaware corporation, as issuer (the "Company"), each of
the Guarantors named therein and Wells Fargo Bank, N.A., as trustee (the
"Trustee") (as amended or supplemented, the "Indenture").

                  THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK BUT WITHOUT GIVING EFFECT TO
APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF
THE LAW OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

                  Each Guarantor hereby agrees to submit to the jurisdiction of
the courts of the State of New York in any action or proceeding arising out of
or relating to this Guarantee.

                  This Guarantee is subject to release upon the terms set forth
in the Indenture.

                                     [GUARANTOR(S)]

                                     By:
                                            ---------------------------------
                                            Name:
                                            Title:

                                      E-1

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00046-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00046-of-00352.parquet"}]]