Document:

<PAGE>
                                                                               .
                                                                               .
                                                                               .

                                                                     EXHIBIT 4.1

<Table>
<S>                                      <C>                                                                <C>

          NUMBER                                                                                                    SHARES
         (ZQ    )                                                  W-H                                             (      )
                                                             ENERGY SERVICES

THIS CERTIFICATE IS TRANSFERABLE IN           INCORPORATED UNDER THE LAWS OF THE STATE OF TEXAS               (CUSIP 92925E 10 8)
NEW YORK, NY, AND DENVER, COLORADO              100,000,000 AUTHORIZED SHARES $.0001 PAR VALUE

                                                                                                                  SEE REVERSE
                                                                                                            FOR CERTAIN DEFINITIONS

         THIS CERTIFIES THAT

         Is The Owner of

                                FULLY-PAID AND NON-ASSESSABLE SHARES OF $.0001 PAR VALUE COMMON OF

                                                         W-H ENERGY SERVICES, INC.

                  transferable on the books of the Corporation by the holder hereof, in person or by duly authorized Attorney,
                  upon surrender of this Certificate properly endorsed. This certificate is not valid until countersigned by the
                  Transfer Agent.

                           IN WITNESS WHEREOF, the said Corporation has caused this Certificate to be signed by its duly
                  authorized officers and to be sealed with the seal of the Corporation.

Dated:

/s/ CATHERINE N. CRABTREE                                                                                /s/ Kenneth P. White, Jr.
-------------------------                                                                                -------------------------
    SECRETARY                                     (W-H ENERGY SERVICES, INC. SEAL)                           PRESIDENT

COUNTERSIGNED AND REGISTERED:
        Computershare Trust Company, Inc.
                  P.O. Box 1886
             Denver, Colorado 80201

By
  ----------------------------------------------------
   Transfer Agent and Registrar, Authorized Signature

</Table>

<PAGE>

                            W-H ENERGY SERVICES, INC.

                TRANSFER FEE: $25.00 PER NEW CERTIFICATE ISSUED

         THE CORPORATION WILL RETURN WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO
REQUESTS THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE PARTICIPATING
OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF OF
THE CORPORATION, AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH
PREFERENCES AND/OR RIGHTS. SUCH REQUESTS MAY BE MADE TO THE CORPORATION OR TO
THE TRANSFER AGENT OF THE CORPORATION.

         This certificate also evidences and entitles the holder hereof to
certain rights as set forth in an Agreement between W-H Energy Services, Inc.
and Computershares Trust Company, Inc. dated as of May 31, 2002, as it may be
amended from time to time (the "Agreement"), the terms of which are hereby
incorporated herein by reference and a copy of which is on file at the principal
executive offices of W-H Energy Services, Inc. Under certain circumstances as
set forth in the Agreement, such Rights (as defined in the Agreement) will be
evidenced by separate certificates and will no longer be evidenced by this
certificate. W-H Energy Services, Inc. will mail to the holder of this
certificate a copy of the Agreement without charge after receipt of a written
request therefor. As set forth in the Agreement Rights beneficially owned by any
Person (as defined in the Agreement) who becomes an Acquiring Person (as defined
in the Agreement) become null and void.

         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<Table>
        <S>                                             <C>
        TEN COM -- as tenants in common                 UNIF GIFT MIN ACT -- _____________ Custodian ___________
        TEN ENT -- as tenants by the entireties                                 (Cust)                  (Minor)
        JT TEN  -- as joint tenants with right of                            Under Uniform Gifts to Minors
                   survivorship and not as tenants                           Act __________________
                   in common                                                           (State)
</Table>

   Additional abbreviations may also be used though not in the above list

_______________________________________________________________________________

For Value Received, __________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE
[                                    ]

_______________________________________________________________________________
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

_______________________________________________________________________________

_______________________________________________________________________________

________________________________________________________________________ shares
of the Common Stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint ___________________________________________
attorney-in-fact to transfer the said stock on the books of the within-named
Corporation, with full power of substitution in the premises.

Dated: __________________

                  _____________________________________________________________

                  NOTICE:  THE SIGNATURE(S) TO THE ASSIGNMENT MUST CORRESPOND
                           WITH THE NAME AS WRITTEN UPON THE FACE OF THE
                           CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION
                           OR ENLARGEMENT OR ANY CHANGE WHATEVER.

Signature(s) guaranteed:

________________________________________

The signature(s) must be guaranteed by an eligible guarantor institution
(Banks, Stockbrokers, Savings and Loan Associations and Credit Unions with
membership in an approved signature guarantee Medallion Program), pursuant to
S.E.C. Rule 17Ad-16.<PAGE>

                                                                     EXHIBIT 4.2

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

                         W-H ENERGY SERVICES, INC.

                                    AND

                     COMPUTERSHARE TRUST COMPANY, INC.

                             RIGHTS AGREEMENT

                         DATED AS OF MAY 31, 2002

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

<PAGE>
                                TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                            Page
                                                                           Number
                                                                           ------
<S>                                                                        <C>
Section 1.  Definitions.....................................................  1
Section 2.  Appointment of Rights Agent.....................................  4
Section 3.  Issue of Right Certificates.....................................  4
Section 4.  Form of Right Certificates......................................  5
Section 5.  Countersignature and Registration...............................  6
Section 6.  Transfer, Split Up, Combination and Exchange of Right
            Certificates; Mutilated, Destroyed, Lost or Stolen Right
            Certificates....................................................  6
Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights...  7
Section 8.  Cancellation and Destruction of Right Certificates..............  8
Section 9.  Availability of Preferred Shares................................  8
Section 10. Preferred Shares Record Date....................................  8
Section 11. Adjustment of Purchase Price, Number of Shares or Number of
            Rights..........................................................  9
Section 12. Certificate of Adjusted Purchase Price or Number of Shares...... 14
Section 13. Consolidation, Merger or Sale or Transfer of Assets or Earning
            Power........................................................... 14
Section 14. Fractional Rights and Fractional Shares......................... 15
Section 15. Rights of Action................................................ 16
Section 16. Agreement of Right Holders...................................... 16
Section 17. Right Certificate Holder Not Deemed a Shareholder............... 17
Section 18. Concerning the Rights Agent..................................... 17
Section 19. Merger or Consolidation or Change of Name of Rights Agent....... 17
Section 20. Duties of Rights Agent.......................................... 18
Section 21. Change of Rights Agent.......................................... 19
Section 22. Issuance of New Right Certificates.............................. 20
Section 23. Redemption...................................................... 20
Section 24. Exchange........................................................ 21
Section 25. Notice of Certain Events........................................ 22
Section 26. Notices......................................................... 23
Section 27. Supplements and Amendments...................................... 23
Section 28. Successors...................................................... 24
Section 29. Benefits of this Agreement...................................... 24
Section 30. Severability.................................................... 24
Section 31. Governing Law................................................... 24
Section 32. Counterparts.................................................... 24
Section 33. Descriptive Headings............................................ 24
Signatures.................................................................. 47
Exhibit A   -    Form of Statement of Designations
Exhibit B   -    Form of Right Certificate
Exhibit C   -    Summary of Rights to Purchase Preferred Shares
</TABLE>

                                      -i-
<PAGE>
            RIGHTS AGREEMENT (this "Agreement"), dated as of May 31, 2002,
between W-H Energy Services, Inc., a Texas corporation (the "Company"), and
Computershare Trust Company, Inc., as rights agent (the "Rights Agent").

            WHEREAS, the Board of Directors of the Company has authorized and
declared a dividend of one preferred share purchase right (a "Right") for each
Common Share (as hereinafter defined) of the Company outstanding on June 6, 2002
(the "Record Date"), each Right representing the right to purchase one
one-hundredth of a Preferred Share (as hereinafter defined), upon the terms and
subject to the conditions herein set forth, and has further authorized and
directed the issuance of one Right with respect to each Common Share that shall
become outstanding between the Record Date and the earliest of the Distribution
Date, the Redemption Date and the Final Expiration Date (as such terms are
hereinafter defined).

            NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth, the parties hereby agree as follows:

            Section 1. Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:

            (a) "Acquiring Person" shall mean any Person who or which, together
with all Affiliates and Associates of such Person, shall be the Beneficial Owner
of 20% or more of the Common Shares of the Company then outstanding, but shall
not include the Company, any Subsidiary of the Company, any employee benefit
plan of the Company or any Subsidiary of the Company or any entity holding
Common Shares for or pursuant to the terms of any such plan. Notwithstanding the
foregoing, no Person shall become an "Acquiring Person" as the result of an
acquisition of Common Shares by the Company which, by reducing the number of
Common Shares of the Company outstanding, increases the proportionate number of
Common Shares of the Company beneficially owned by such Person to 20% or more of
the Common Shares of the Company then outstanding; provided, however, that, if a
Person shall become the Beneficial Owner of 20% or more of the Common Shares of
the Company then outstanding by reason of share purchases by the Company and
shall, after such share purchases by the Company, become the Beneficial Owner of
any additional Common Shares of the Company, then such Person shall be deemed to
be an "Acquiring Person." Notwithstanding the foregoing, if the Board of
Directors of the Company determines in good faith that a Person who would
otherwise be an "Acquiring Person," as defined pursuant to the foregoing
provisions of this paragraph (a), has become such inadvertently, and such Person
divests as promptly as practicable a sufficient number of Common Shares so that
such Person would no longer be an "Acquiring Person," as defined pursuant to the
foregoing provisions of this paragraph (a), then such Person shall not be deemed
to be an "Acquiring Person" for any purposes of this Agreement.

            (b) "Affiliate" shall have the meaning ascribed to such term in Rule
12b-2 of the General Rules and Regulations under the Exchange Act as in effect
on the date of this Agreement.

            (c) "Associate" shall have the meaning ascribed to such term in Rule
12b-2 of the General Rules and Regulations under the Exchange Act as in effect
on the date of this Agreement.

<PAGE>

            (d) A Person shall be deemed the "Beneficial Owner" of and shall be
deemed to "beneficially own" any securities which:

            (i) such Person or any of such Person's Affiliates or Associates
      beneficially owns, directly or indirectly, within the meaning of the
      General Rules and Regulations promulgated with respect to either Section
      13 or Section 16 of the Exchange Act;

            (ii) such Person or any of such Person's Affiliates or Associates
      has (A) the right to acquire (whether such right is exercisable
      immediately or only after the passage of time) pursuant to any agreement,
      arrangement or understanding (other than customary agreements with and
      between underwriters and selling group members with respect to a bona fide
      public offering of securities), or upon the exercise of conversion rights,
      exchange rights, rights (other than these Rights), warrants or options, or
      otherwise; provided, however, that a Person shall not be deemed the
      Beneficial Owner of, or to beneficially own, securities tendered pursuant
      to a tender or exchange offer made by or on behalf of such Person or any
      of such Person's Affiliates or Associates until such tendered securities
      are accepted for purchase or exchange; or (B) the right to vote pursuant
      to any agreement, arrangement or understanding; provided, however, that a
      Person shall not be deemed the Beneficial Owner of, or to beneficially
      own, any security if the agreement, arrangement or understanding to vote
      such security (1) arises solely from a revocable proxy or consent given to
      such Person in response to a public proxy or consent solicitation made
      pursuant to, and in accordance with, the applicable rules and regulations
      promulgated under the Exchange Act and (2) is not also then reportable on
      Schedule 13D under the Exchange Act (or any comparable or successor
      report); or

            (iii) are beneficially owned, directly or indirectly, by any other
      Person with which such Person or any of such Person's Affiliates or
      Associates has any agreement, arrangement or understanding (other than
      customary agreements with and between underwriters and selling group
      members with respect to a bona fide public offering of securities) for the
      purpose of acquiring, holding, voting (except to the extent contemplated
      by the proviso to Section 1(d)(ii)(B) hereof) or disposing of any
      securities of the Company.

            Notwithstanding anything in this definition of Beneficial Ownership
to the contrary, the phrase "then outstanding," when used with reference to a
Person's Beneficial Ownership of securities of the Company, shall mean the
number of such securities then issued and outstanding together with the number
of such securities not then actually issued and outstanding which such Person
would be deemed to own beneficially hereunder.

            (e) "Business Day" shall mean any day other than a Saturday, a
Sunday, or a day on which banking institutions in Colorado are authorized or
obligated by law or executive order to close.

            (f) "Close of Business" on any given date shall mean 5:00 P.M.,
Denver time, on such date; provided, however, that, if such date is not a
Business Day, it shall mean 5:00 P.M., Denver time, on the next succeeding
Business Day.

                                      -2-
<PAGE>

            (g) "Common Shares" when used with reference to the Company shall
mean the shares of common stock, par value $0.0001 per share, of the Company.
"Common Shares" when used with reference to any Person other than the Company
shall mean the capital stock (or equity interest) with the greatest voting power
of such other Person or, if such other Person is a Subsidiary of another Person,
the Person or Persons which ultimately control such first-mentioned Person.

            (h) "Company" shall have the meaning set forth in the first
paragraph hereof.

            (i) "Distribution Date" shall have the meaning set forth in Section
3(a) hereof.

            (j) "Exchange Act" shall mean the Securities Exchange Act of 1934,
as amended.

            (k) "Exchange Ratio" shall have the meaning set forth in Section
24(a) hereof.

            (l) "Final Expiration Date" shall have the meaning set forth in
Section 7(a) hereof.

            (m) "NASDAQ" shall mean the National Association of Securities
Dealers, Inc. Automated Quotation System.

            (n) "Person" shall mean any individual, firm, corporation or other
entity, and shall include any successor (by merger or otherwise) of such entity.

            (o) "Preferred Shares" shall mean shares of Series A Junior
Participating Preferred Stock, par value $.01 per share, of the Company having
the rights and preferences set forth in the Form of Statement of Designations
attached to this Agreement as Exhibit A.

            (p) "Purchase Price" shall have the meaning set forth in Section 4
hereof.

            (q) "Record Date" shall have the meaning set forth in the recitals
hereof.

            (r) "Redemption Date" shall have the meaning set forth in Section
7(a) hereof.

            (s) "Redemption Price" shall have the meaning set forth in Section
23(a) hereof.

            (t) "Right" shall have the meaning set forth in the recitals hereof.

            (u) "Right Certificate" shall have the meaning set forth in Section
3(a) hereof.

            (v) "Rights Agent" shall have the meaning set forth in the preamble
hereof.

            (w) "Security" shall have the meaning set forth in Section 11(d).

            (x) "Shares Acquisition Date" shall mean the first date of public
announcement by the Company or an Acquiring Person that an Acquiring Person has
become such.

                                      -3-
<PAGE>

            (y) "Subsidiary" of any Person shall mean any corporation or other
entity of which a majority of the voting power of the voting equity securities
or equity interest is owned, directly or indirectly, by such Person.

            (z) "Summary of Rights" shall have the meaning set forth in Section
3(b) hereof.

            (aa) "Trading Day" shall have the meaning set forth in Section 11(d)
hereof.

            Section 2.  Appointment of Rights Agent. The Company hereby appoints
the Rights Agent to act as agent for the Company and the holders of the Rights
(who, in accordance with Section 3 hereof, shall, prior to the Distribution
Date, also be the holders of the Common Shares of the Company) in accordance
with the terms and conditions hereof, and the Rights Agent hereby accepts such
appointment. The Company may from time to time appoint such co-Rights Agents as
it may deem necessary or desirable.

            Section 3. Issue of Right Certificates. (a) Until the earlier of (i)
the tenth day after the Shares Acquisition Date or (ii) the tenth Business Day
(or such later date as may be determined by action of the Board of Directors of
the Company prior to such time as any Person becomes an Acquiring Person) after
the date of the commencement by any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or of any
Subsidiary of the Company or any entity holding Common Shares of the Company for
or pursuant to the terms of any such plan) of, or after the date of the first
public announcement of the intention of any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or of any
Subsidiary of the Company or any entity holding Common Shares of the Company for
or pursuant to the terms of any such plan) to commence, a tender or exchange
offer the consummation of which would result in any Person becoming the
Beneficial Owner of Common Shares of the Company aggregating 20% or more of the
then outstanding Common Shares of the Company (including any such date which is
after the date of this Agreement and prior to the issuance of the Rights; the
earlier of such dates being herein referred to as the "Distribution Date"), (x)
the Rights will be evidenced (subject to the provisions of Section 3(b) hereof)
by the certificates for Common Shares of the Company registered in the names of
the holders thereof (which certificates shall also be deemed to be Right
Certificates) and not by separate Right Certificates, and (y) the right to
receive Right Certificates will be transferable only in connection with the
transfer of Common Shares of the Company. As soon as practicable after the
Distribution Date, the Company will prepare and execute, the Rights Agent will
countersign, and the Company will send or cause to be sent (and the Rights Agent
will, if requested, send) by first-class, insured, postage-prepaid mail, to each
record holder of Common Shares of the Company as of the Close of Business on the
Distribution Date, at the address of such holder shown on the records of the
Company, a Right Certificate, in substantially the form of Exhibit B hereto (a
"Right Certificate"), evidencing one Right for each Common Share so held. As of
the Distribution Date, the Rights will be evidenced solely by such Right
Certificates.

            (b) On the Record Date, or as soon as practicable thereafter, the
Company will send a copy of a Summary of Rights to Purchase Preferred Shares, in
substantially the form of Exhibit C hereto (the "Summary of Rights"), by
first-class, postage-prepaid mail, to each record

                                      -4-
<PAGE>

holder of Common Shares as of the Close of Business on the Record Date, at the
address of such holder shown on the records of the Company. With respect to
certificates for Common Shares of the Company outstanding as of the Record Date,
until the Distribution Date, the Rights will be evidenced by such certificates
registered in the names of the holders thereof together with a copy of the
Summary of Rights attached thereto. Until the Distribution Date (or the earlier
of the Redemption Date or the Final Expiration Date), the surrender for transfer
of any certificate for Common Shares of the Company outstanding on the Record
Date, with or without a copy of the Summary of Rights attached thereto, shall
also constitute the transfer of the Rights associated with the Common Shares of
the Company represented thereby.

            (c) Certificates for Common Shares which become outstanding
(including, without limitation, reacquired Common Shares referred to in the last
sentence of this paragraph (c)) after the Record Date but prior to the earliest
of the Distribution Date, the Redemption Date or the Final Expiration Date shall
have impressed on, printed on, written on or otherwise affixed to them the
following legend:

      This certificate also evidences and entitles the holder hereof to certain
      rights as set forth in an Agreement between W-H Energy Services, Inc. and
      Computershare Trust Company, Inc., dated as of May 31, 2002, as it may be
      amended from time to time (the "Agreement"), the terms of which are hereby
      incorporated herein by reference and a copy of which is on file at the
      principal executive offices of W-H Energy Services, Inc. Under certain
      circumstances, as set forth in the Agreement, such Rights (as defined in
      the Agreement) will be evidenced by separate certificates and will no
      longer be evidenced by this certificate. W-H Energy Services, Inc. will
      mail to the holder of this certificate a copy of the Agreement without
      charge after receipt of a written request therefor. As set forth in the
      Agreement, Rights beneficially owned by any Person (as defined in the
      Agreement) who becomes an Acquiring Person (as defined in the Agreement)
      become null and void.

With respect to such certificates containing the foregoing legend, until the
Distribution Date, the Rights associated with the Common Shares of the Company
represented by such certificates shall be evidenced by such certificates alone,
and the surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares of the Company
represented thereby. In the event that the Company purchases or acquires any
Common Shares of the Company after the Record Date but prior to the Distribution
Date, any Rights associated with such Common Shares of the Company shall be
deemed cancelled and retired so that the Company shall not be entitled to
exercise any Rights associated with the Common Shares of the Company which are
no longer outstanding.

            Section 4. Form of Right Certificates. The Right Certificates (and
the forms of election to purchase Preferred Shares and of assignment to be
printed on the reverse thereof) shall be substantially the same as Exhibit B
hereto, and may have such marks of identification or designation and such
legends, summaries or endorsements printed thereon as the Company may deem
appropriate and as are not inconsistent with the provisions of this Agreement,
or as may be required to comply with any applicable law or with any applicable
rule or regulation made pursuant thereto or with any applicable rule or
regulation of any stock exchange or the National Association of Securities
Dealers, Inc., or to conform to usage. Subject to the provisions of

                                      -5-
<PAGE>

Section 22 hereof, the Right Certificates shall entitle the holders thereof to
purchase such number of one one-hundredths of a Preferred Share as shall be set
forth therein at the price per one one-hundredth of a Preferred Share set forth
therein (the "Purchase Price"), but the number of such one one-hundredths of a
Preferred Share and the Purchase Price shall be subject to adjustment as
provided herein.

            Section 5. Countersignature and Registration. The Right Certificates
shall be executed on behalf of the Company by its Chairman of the Board, its
Chief Executive Officer, its President or any of its Vice Presidents, either
manually or by facsimile signature, shall have affixed thereto the Company's
seal or a facsimile thereof, and shall be attested by the Secretary or an
Assistant Secretary of the Company, either manually or by facsimile signature.
The Right Certificates shall be manually countersigned by the Rights Agent and
shall not be valid for any purpose unless countersigned. In case any officer of
the Company who shall have signed any of the Right Certificates shall cease to
be such officer of the Company before countersignature by the Rights Agent and
issuance and delivery by the Company, such Right Certificates, nevertheless, may
be countersigned by the Rights Agent and issued and delivered by the Company
with the same force and effect as though the individual who signed such Right
Certificates had not ceased to be such officer of the Company; and any Right
Certificate may be signed on behalf of the Company by any individual who, at the
actual date of the execution of such Right Certificate, shall be a proper
officer of the Company to sign such Right Certificate, although at the date of
the execution of this Agreement any such individual was not such an officer.

            Following the Distribution Date, the Rights Agent will keep or cause
to be kept, at its principal office, books for registration and transfer of the
Right Certificates issued hereunder. Such books shall show the names and
addresses of the respective holders of the Right Certificates, the number of
Rights evidenced on its face by each of the Right Certificates and the date of
each of the Right Certificates.

            Section 6. Transfer, Split Up, Combination and Exchange of Right
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates. Subject
to the provisions of Section 14 hereof, at any time after the Close of Business
on the Distribution Date, and at or prior to the Close of Business on the
earlier of the Redemption Date or the Final Expiration Date, any Right
Certificate or Right Certificates (other than Right Certificates representing
Rights that have become void pursuant to Section 11(a)(ii) hereof or that have
been exchanged pursuant to Section 24 hereof) may be transferred, split up,
combined or exchanged for another Right Certificate or Right Certificates
entitling the registered holder to purchase a like number of one one-hundredths
of a Preferred Share as the Right Certificate or Right Certificates surrendered
then entitled such holder to purchase. Any registered holder desiring to
transfer, split up, combine or exchange any Right Certificate or Right
Certificates shall make such request in writing delivered to the Rights Agent,
and shall surrender the Right Certificate or Right Certificates to be
transferred, split up, combined or exchanged at the principal office of the
Rights Agent. Thereupon the Rights Agent shall countersign and deliver to the
Person entitled thereto a Right Certificate or Right Certificates, as the case
may be, as so requested. The Company may require payment of a sum sufficient to
cover any tax or governmental charge that may be imposed in connection with any
transfer, split up, combination or exchange of Right Certificates.

                                      -6-
<PAGE>

            Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Right Certificate, and, in case of loss, theft or destruction, of indemnity or
security reasonably satisfactory to them, and, at the Company's request,
reimbursement to the Company and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Right Certificate if mutilated, the Company will make and deliver a new
Right Certificate of like tenor to the Rights Agent for delivery to the
registered holder in lieu of the Right Certificate so lost, stolen, destroyed or
mutilated.

            Section 7. Exercise of Rights; Purchase Price; Expiration Date of
Rights. (a) The registered holder of any Right Certificate may exercise the
Rights evidenced thereby (except as otherwise provided herein), in whole or in
part, at any time after the Distribution Date, upon surrender of the Right
Certificate, with the form of election to purchase on the reverse side thereof
duly executed, to the Rights Agent at the principal office of the Rights Agent,
together with payment of the Purchase Price for each one one-hundredth of a
Preferred Share as to which the Rights are exercised, at or prior to the
earliest of (i) the Close of Business on June 6, 2012 (the "Final Expiration
Date"), (ii) the time at which the Rights are redeemed as provided in Section 23
hereof (the "Redemption Date"), or (iii) the time at which such Rights are
exchanged as provided in Section 24 hereof.

            (b) The Purchase Price for each one one-hundredth of a Preferred
Share purchasable pursuant to the exercise of a Right shall initially be $110,
and shall be subject to adjustment from time to time as provided in Section 11
or 13 hereof, and shall be payable in lawful money of the United States of
America in accordance with paragraph (c) below.

            (c) Upon receipt of a Right Certificate representing exercisable
Rights, with the form of election to purchase duly executed, accompanied by
payment of the Purchase Price for the shares to be purchased and an amount equal
to any applicable transfer tax required to be paid by the holder of such Right
Certificate in accordance with Section 9 hereof by certified check, cashier's
check or money order payable to the order of the Company, the Rights Agent shall
thereupon promptly (i) (A) requisition from any transfer agent of the Preferred
Shares certificates for the number of Preferred Shares to be purchased and the
Company hereby irrevocably authorizes any such transfer agent to comply with all
such requests, or (B) requisition from the depositary agent depositary receipts
representing such number of one one-hundredths of a Preferred Share as are to be
purchased (in which case certificates for the Preferred Shares represented by
such receipts shall be deposited by the transfer agent of the Preferred Shares
with such depositary agent) and the Company hereby directs such depositary agent
to comply with such request; (ii) when appropriate, requisition from the Company
the amount of cash to be paid in lieu of issuance of fractional shares in
accordance with Section 14 hereof; (iii) promptly after receipt of such
certificates or depositary receipts, cause the same to be delivered to or upon
the order of the registered holder of such Right Certificate, registered in such
name or names as may be designated by such holder; and (iv) when appropriate,
after receipt, promptly deliver such cash to or upon the order of the registered
holder of such Right Certificate.

            (d) In case the registered holder of any Right Certificate shall
exercise less than all the Rights evidenced thereby, a new Right Certificate
evidencing Rights equivalent to

                                      -7-
<PAGE>

the Rights remaining unexercised shall be issued by the Rights Agent to
registered holder of such Right Certificate or to such holder's duly authorized
assigns, subject to the provisions of Section 14 hereof.

            Section 8. Cancellation and Destruction of Right Certificates. All
Right Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in cancelled form,
or, if surrendered to the Rights Agent, shall be cancelled by it, and no Right
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Right Certificate purchased or acquired by the Company
otherwise than upon the exercise thereof. The Rights Agent shall deliver all
cancelled Right Certificates to the Company, or shall, at the written request of
the Company, destroy such cancelled Right Certificates, and, in such case, shall
deliver a certificate of destruction thereof to the Company.

            Section 9. Availability of Preferred Shares. The Company covenants
and agrees that it will cause to be reserved and kept available out of its
authorized and unissued Preferred Shares or any Preferred Shares held in its
treasury the number of Preferred Shares that will be sufficient to permit the
exercise in full of all outstanding Rights in accordance with Section 7 hereof.
The Company covenants and agrees that it will take all such action as may be
necessary to ensure that all Preferred Shares delivered upon exercise of Rights
shall, at the time of delivery of the certificates for such Preferred Shares
(subject to payment of the Purchase Price), be duly and validly authorized and
issued and fully paid and nonassessable shares.

            The Company further covenants and agrees that it will pay when due
and payable any and all federal and state transfer taxes and charges which may
be payable in respect of the issuance or delivery of the Right Certificates or
of any Preferred Shares upon the exercise of Rights. The Company shall not,
however, be required to pay any transfer tax which may be payable in respect of
any transfer or delivery of Right Certificates to a Person other than, or the
issuance or delivery of certificates or depositary receipts for the Preferred
Shares in a name other than that of, the registered holder of the Right
Certificate evidencing Rights surrendered for exercise or to issue or to deliver
any certificates or depositary receipts for Preferred Shares upon the exercise
of any Rights until any such tax shall have been paid (any such tax being
payable by the holder of such Right Certificate at the time of surrender) or
until it has been established to the Company's reasonable satisfaction that no
such tax is due.

            Section 10. Preferred Shares Record Date. Each Person in whose name
any certificate for Preferred Shares is issued upon the exercise of Rights shall
for all purposes be deemed to have become the holder of record of the Preferred
Shares represented thereby on, and such certificate shall be dated, the date
upon which the Right Certificate evidencing such Rights was duly surrendered and
payment of the Purchase Price (and any applicable transfer taxes) was made;
provided, however, that, if the date of such surrender and payment is a date
upon which the Preferred Shares transfer books of the Company are closed, such
Person shall be deemed to have become the record holder of such shares on, and
such certificate shall be dated, the next succeeding Business Day on which the
Preferred Shares transfer books of the Company are open. Prior to the exercise
of the Rights evidenced thereby, the holder of a Right Certificate

                                      -8-
<PAGE>

shall not be entitled to any rights of a holder of Preferred Shares for which
the Rights shall be exercisable, including, without limitation, the right to
vote, to receive dividends or other distributions or to exercise any preemptive
rights, and shall not be entitled to receive any notice of any proceedings of
the Company, except as provided herein.

            Section 11. Adjustment of Purchase Price, Number of Shares or Number
of Rights. The Purchase Price, the number of Preferred Shares covered by each
Right and the number of Rights outstanding are subject to adjustment from time
to time as provided in this Section 11.

            (a) (i) In the event the Company shall at any time after the date of
this Agreement (A) declare a dividend on the Preferred Shares payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares into a smaller number of Preferred Shares or
(D) issue any shares of its capital stock in a reclassification of the Preferred
Shares (including any such reclassification in connection with a consolidation
or merger in which the Company is the continuing or surviving corporation),
except as otherwise provided in this Section 11(a), the Purchase Price in effect
at the time of the record date for such dividend or of the effective date of
such subdivision, combination or reclassification, and the number and kind of
shares of capital stock issuable on such date, shall be proportionately adjusted
so that the holder of any Right exercised after such time shall be entitled to
receive the aggregate number and kind of shares of capital stock which, if such
Right had been exercised immediately prior to such date and at a time when the
Preferred Shares transfer books of the Company were open, such holder would have
owned upon such exercise and been entitled to receive by virtue of such
dividend, subdivision, combination or reclassification; provided, however, that
in no event shall the consideration to be paid upon the exercise of one Right be
less than the aggregate par value of the shares of capital stock of the Company
issuable upon exercise of one Right.

            (ii) Subject to Section 24 hereof, in the event any Person becomes
an Acquiring Person, each holder of a Right shall thereafter have a right to
receive, upon exercise thereof at a price equal to the then current Purchase
Price multiplied by the number of one one-hundredths of a Preferred Share for
which a Right is then exercisable, in accordance with the terms of this
Agreement and in lieu of Preferred Shares, such number of Common Shares of the
Company as shall equal the result obtained by (A) multiplying the then current
Purchase Price by the number of one one-hundredths of a Preferred Share for
which a Right is then exercisable and dividing that product by (B) 50% of the
then current per share market price of the Common Shares of the Company
(determined pursuant to Section 11(d) hereof) on the date of the occurrence of
such event. In the event that any Person shall become an Acquiring Person and
the Rights shall then be outstanding, the Company shall not take any action
which would eliminate or diminish the benefits intended to be afforded by the
Rights.

            From and after the occurrence of such event, any Rights that are or
were acquired or beneficially owned by any Acquiring Person (or any Associate or
Affiliate of such Acquiring Person) shall be void, and any holder of such Rights
shall thereafter have no right to exercise such Rights under any provision of
this Agreement. No Right Certificate shall be issued pursuant to Section 3
hereof that represents Rights beneficially owned by an Acquiring Person whose
Rights would be void pursuant to the preceding sentence or any Associate or
Affiliate

                                      -9-
<PAGE>

thereof; no Right Certificate shall be issued at any time upon the transfer of
any Rights to an Acquiring Person whose Rights would be void pursuant to the
preceding sentence or any Associate or Affiliate thereof or to any nominee of
such Acquiring Person, Associate or Affiliate; and any Right Certificate
delivered to the Rights Agent for transfer to an Acquiring Person whose Rights
would be void pursuant to the preceding sentence shall be cancelled.

            (iii) In the event that there shall not be sufficient Common Shares
issued but not outstanding or authorized but unissued to permit the exercise in
full of the Rights in accordance with subparagraph (ii) above, the Company shall
take all such action as may be necessary to authorize additional Common Shares
for issuance upon exercise of the Rights. In the event the Company shall, after
good faith effort, be unable to take all such action as may be necessary to
authorize such additional Common Shares, the Company shall substitute, for each
Common Share that would otherwise be issuable upon exercise of a Right, a number
of Preferred Shares or fraction thereof such that the current per share market
price of one Preferred Share multiplied by such number or fraction is equal to
the current per share market price of one Common Share as of the date of
issuance of such Preferred Shares or fraction thereof.

            (b) In case the Company shall fix a record date for the issuance of
rights, options or warrants to all holders of Preferred Shares entitling them
(for a period expiring within 45 calendar days after such record date) to
subscribe for or purchase Preferred Shares (or shares having the same rights,
privileges and preferences as the Preferred Shares ("equivalent preferred
shares")) or securities convertible into Preferred Shares or equivalent
preferred shares at a price per Preferred Share or equivalent preferred share
(or having a conversion price per share, if a security convertible into
Preferred Shares or equivalent preferred shares) less than the then current per
share market price of the Preferred Shares (as defined in Section 11(d)) on such
record date, the Purchase Price to be in effect after such record date shall be
determined by multiplying the Purchase Price in effect immediately prior to such
record date by a fraction, the numerator of which shall be the number of
Preferred Shares outstanding on such record date plus the number of Preferred
Shares which the aggregate offering price of the total number of Preferred
Shares and/or equivalent preferred shares so to be offered (and/or the aggregate
initial conversion price of the convertible securities so to be offered) would
purchase at such current market price and the denominator of which shall be the
number of Preferred Shares outstanding on such record date plus the number of
additional Preferred Shares and/or equivalent preferred shares to be offered for
subscription or purchase (or into which the convertible securities so to be
offered are initially convertible); provided, however, that in no event shall
the consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of capital stock of the Company issuable upon
exercise of one Right. In case such subscription price may be paid in a
consideration part or all of which shall be in a form other than cash, the value
of such consideration shall be as determined in good faith by the Board of
Directors of the Company, whose determination shall be described in a statement
filed with the Rights Agent and shall be binding on the Rights Agent and holders
of the Rights. Preferred Shares owned by or held for the account of the Company
shall not be deemed outstanding for the purpose of any such computation. Such
adjustment shall be made successively whenever such a record date is fixed; and,
in the event that such rights, options or warrants are not so issued, the
Purchase Price shall be adjusted to be the Purchase Price which would then be in
effect if such record date had not been fixed.

                                      -10-
<PAGE>

            (c) In case the Company shall fix a record date for the making of a
distribution to all holders of the Preferred Shares (including any such
distribution made in connection with a consolidation or merger in which the
Company is the continuing or surviving corporation) of evidences of indebtedness
or assets (other than a regular quarterly cash dividend or a dividend payable in
Preferred Shares) or subscription rights or warrants (excluding those referred
to in Section 11(b) hereof), the Purchase Price to be in effect after such
record date shall be determined by multiplying the Purchase Price in effect
immediately prior to such record date by a fraction, the numerator of which
shall be the then-current per share market price of the Preferred Shares on such
record date, less the fair market value (as determined in good faith by the
Board of Directors of the Company, whose determination shall be described in a
statement filed with the Rights Agent and shall be binding on the Rights Agent
and holders of the Rights) of the portion of the assets or evidences of
indebtedness so to be distributed or of such subscription rights or warrants
applicable to one Preferred Share and the denominator of which shall be such
then-current per share market price of the Preferred Shares on such record date;
provided, however, that in no event shall the consideration to be paid upon the
exercise of one Right be less than the aggregate par value of the shares of
capital stock of the Company to be issued upon exercise of one Right. Such
adjustments shall be made successively whenever such a record date is fixed;
and, in the event that such distribution is not so made, the Purchase Price
shall again be adjusted to be the Purchase Price which would then be in effect
if such record date had not been fixed.

            (d) (i) For the purpose of any computation hereunder, the "current
per share market price" of any security (a "Security" for the purpose of this
Section 11(d)(i)) on any date shall be deemed to be the average of the daily
closing prices per share of such Security for the 30 consecutive Trading Days
immediately prior to such date; provided, however, that, in the event that the
current per share market price of the Security is determined during a period
following the announcement by the issuer of such Security of (A) a dividend or
distribution on such Security payable in shares of such Security or Securities
convertible into such shares, or (B) any subdivision, combination or
reclassification of such Security and prior to the expiration of 30 Trading Days
after the ex-dividend date for such dividend or distribution, or the record date
for such subdivision, combination or reclassification, then, and in each such
case, the current per share market price shall be appropriately adjusted to
reflect the current market price per share equivalent of such Security. The
closing price for each day shall be the last sale price, regular way, reported
at or prior to 4:00 P.M. Eastern time or, in case no such sale takes place on
such day, the average of the bid and asked prices, regular way, reported as of
4:00 P.M. Eastern time, in either case, as reported in the principal
consolidated transaction reporting system with respect to securities listed on
the principal national securities exchange on which the Security is listed or
admitted to trading or, if the Security is not listed or admitted to trading on
any national securities exchange, the last quoted price reported at or prior to
4:00 P.M. Eastern time or, if not so quoted, the average of the high bid and low
asked prices in the over-the-counter market, as reported as of 4:00 P.M. Eastern
time by NASDAQ or such other system then in use, or, if on any such date the
Security is not quoted by any such organization, the average of the closing bid
and asked prices as furnished by a professional market maker making a market in
the Security selected by the Board of Directors of the Company. The term
"Trading Day" shall mean a day on which the principal national securities
exchange on which the Security is listed or admitted to trading is open for the
transaction of business, or, if the Security is not listed or admitted to
trading on any national securities exchange, a Business Day.

                                      -11-
<PAGE>

            (ii) For the purpose of any computation hereunder, the "current per
share market price" of the Preferred Shares shall be determined in accordance
with the method set forth in Section 11(d)(i). If the Preferred Shares are not
publicly traded, the "current per share market price" of the Preferred Shares
shall be conclusively deemed to be the current per share market price of the
Common Shares as determined pursuant to Section 11(d)(i) hereof (appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof), multiplied by one hundred. If neither the
Common Shares nor the Preferred Shares are publicly held or so listed or traded,
"current per share market price" shall mean the fair value per share as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent.

            (e) No adjustment in the Purchase Price shall be required unless
such adjustment would require an increase or decrease of at least 1% in the
Purchase Price; provided, however, that any adjustments which by reason of this
Section 11(e) are not required to be made shall be carried forward and taken
into account in any subsequent adjustment. All calculations under this Section
11 shall be made to the nearest cent or to the nearest one one-millionth of a
Preferred Share or one ten-thousandth of any other share or security as the case
may be. Notwithstanding the first sentence of this Section 11(e), any adjustment
required by this Section 11 shall be made no later than the earlier of (i) three
years from the date of the transaction which requires such adjustment or (ii)
the date of the expiration of the right to exercise any Rights.

            (f) If, as a result of an adjustment made pursuant to Section 11(a)
hereof, the holder of any Right thereafter exercised shall become entitled to
receive any shares of capital stock of the Company other than Preferred Shares,
thereafter the number of such other shares so receivable upon exercise of any
Right shall be subject to adjustment from time to time in a manner and on terms
as nearly equivalent as practicable to the provisions with respect to the
Preferred Shares contained in Section 11(a) through (c) hereof, inclusive, and
the provisions of Sections 7, 9, 10 and 13 hereof with respect to the Preferred
Shares shall apply on like terms to any such other shares.

            (g) All Rights originally issued by the Company subsequent to any
adjustment made to the Purchase Price hereunder shall evidence the right to
purchase, at the adjusted Purchase Price, the number of one one-hundredths of a
Preferred Share purchasable from time to time hereunder upon exercise of the
Rights, all subject to further adjustment as provided herein.

            (h) Unless the Company shall have exercised its election as provided
in Section 11(i) hereof, upon each adjustment of the Purchase Price as a result
of the calculations made in Sections 11(b) and (c) hereof, each Right
outstanding immediately prior to the making of such adjustment shall thereafter
evidence the right to purchase, at the adjusted Purchase Price, that number of
one one-hundredths of a Preferred Share (calculated to the nearest one
one-millionth of a Preferred Share) obtained by (A) multiplying (x) the number
of one one-hundredths of a share covered by a Right immediately prior to this
adjustment by (y) the Purchase Price in effect immediately prior to such
adjustment of the Purchase Price and (B) dividing the product so obtained by the
Purchase Price in effect immediately after such adjustment of the Purchase
Price.

                                      -12-
<PAGE>

            (i) The Company may elect, on or after the date of any adjustment of
the Purchase Price, to adjust the number of Rights in substitution for any
adjustment in the number of one one-hundredths of a Preferred Share purchasable
upon the exercise of a Right. Each of the Rights outstanding after such
adjustment of the number of Rights shall be exercisable for the number of one
one-hundredths of a Preferred Share for which a Right was exercisable
immediately prior to such adjustment. Each Right held of record prior to such
adjustment of the number of Rights shall become that number of Rights
(calculated to the nearest one ten-thousandth) obtained by dividing the Purchase
Price in effect immediately prior to adjustment of the Purchase Price by the
Purchase Price in effect immediately after adjustment of the Purchase Price. The
Company shall make a public announcement of its election to adjust the number of
Rights, indicating the record date for the adjustment, and, if known at the
time, the amount of the adjustment to be made. This record date may be the date
on which the Purchase Price is adjusted or any day thereafter, but, if the Right
Certificates have been issued, shall be at least 10 days later than the date of
the public announcement. If Right Certificates have been issued, upon each
adjustment of the number of Rights pursuant to this Section 11(i), the Company
shall, as promptly as practicable, cause to be distributed to holders of record
of Right Certificates on such record date Right Certificates evidencing, subject
to Section 14 hereof, the additional Rights to which such holders shall be
entitled as a result of such adjustment, or, at the option of the Company, shall
cause to be distributed to such holders of record in substitution and
replacement for the Right Certificates held by such holders prior to the date of
adjustment, and upon surrender thereof, if required by the Company, new Right
Certificates evidencing all the Rights to which such holders shall be entitled
after such adjustment. Right Certificates so to be distributed shall be issued,
executed and countersigned in the manner provided for herein, and shall be
registered in the names of the holders of record of Right Certificates on the
record date specified in the public announcement.

            (j) Irrespective of any adjustment or change in the Purchase Price
or in the number of one one-hundredths of a Preferred Share issuable upon the
exercise of the Rights, the Right Certificates theretofore and thereafter issued
may continue to express the Purchase Price and the number of one one-hundredths
of a Preferred Share which were expressed in the initial Right Certificates
issued hereunder.

            (k) Before taking any action that would cause an adjustment reducing
the Purchase Price below one one-hundredth of the then par value, if any, of the
Preferred Shares issuable upon exercise of the Rights, the Company shall take
any corporate action which may, in the opinion of its counsel, be necessary in
order that the Company may validly and legally issue fully paid and
nonassessable Preferred Shares at such adjusted Purchase Price.

            (l) In any case in which this Section 11 shall require that an
adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuing to the holder of any Right exercised after such record date of
the Preferred Shares and other capital stock or securities of the Company, if
any, issuable upon such exercise over and above the Preferred Shares and other
capital stock or securities of the Company, if any, issuable upon such exercise
on the basis of the Purchase Price in effect prior to such adjustment; provided,
however, that the Company shall deliver to such holder a due bill or other
appropriate instrument evidencing such holder's right to receive such additional
shares upon the occurrence of the event requiring such adjustment.

                                      -13-
<PAGE>

            (m) Anything in this Section 11 to the contrary notwithstanding, the
Company shall be entitled to make such reductions in the Purchase Price, in
addition to those adjustments expressly required by this Section 11, as and to
the extent that it, in its sole discretion, shall determine to be advisable in
order that any consolidation or subdivision of the Preferred Shares, issuance
wholly for cash of any Preferred Shares at less than the current market price,
issuance wholly for cash of Preferred Shares or securities which by their terms
are convertible into or exchangeable for Preferred Shares, dividends on
Preferred Shares payable in Preferred Shares or issuance of rights, options or
warrants referred to in Section 11(b) hereof, hereafter made by the Company to
holders of the Preferred Shares shall not be taxable to such shareholders.

            (n) In the event that, at any time after the date of this Agreement
and prior to the Distribution Date, the Company shall (i) declare or pay any
dividend on the Common Shares payable in Common Shares, or (ii) effect a
subdivision, combination or consolidation of the Common Shares (by
reclassification or otherwise than by payment of dividends in Common Shares)
into a greater or lesser number of Common Shares, then, in any such case, (A)
the number of one one-hundredths of a Preferred Share purchasable after such
event upon proper exercise of each Right shall be determined by multiplying the
number of one one-hundredths of a Preferred Share so purchasable immediately
prior to such event by a fraction, the numerator of which is the number of
Common Shares outstanding immediately before such event and the denominator of
which is the number of Common Shares outstanding immediately after such event,
and (B) each Common Share outstanding immediately after such event shall have
issued with respect to it that number of Rights which each Common Share
outstanding immediately prior to such event had issued with respect to it. The
adjustments provided for in this Section 11(n) shall be made successively
whenever such a dividend is declared or paid or such a subdivision, combination
or consolidation is effected.

            Section 12. Certificate of Adjusted Purchase Price or Number of
Shares. Whenever an adjustment is made as provided in Section 11 or 13 hereof,
the Company shall promptly (a) prepare a certificate setting forth such
adjustment and a brief statement of the facts accounting for such adjustment,
(b) file with the Rights Agent and with each transfer agent for the Common
Shares or the Preferred Shares and the Securities and Exchange Commission a copy
of such certificate and (c) if such adjustment occurs at any time after the
Distribution Date, mail a brief summary thereof to each holder of a Right
Certificate in accordance with Section 25 hereof.

            Section 13. Consolidation, Merger or Sale or Transfer of Assets or
Earning Power. In the event, directly or indirectly, at any time after a Person
has become an Acquiring Person, (a) the Company shall consolidate with, or merge
with and into, any other Person, (b) any Person shall consolidate with the
Company, or merge with and into the Company and the Company shall be the
continuing or surviving corporation of such merger and, in connection with such
merger, all or part of the Common Shares shall be changed into or exchanged for
stock or other securities of any other Person (or the Company) or cash or any
other property, or (c) the Company shall sell or otherwise transfer (or one or
more of its Subsidiaries shall sell or otherwise transfer), in one or more
transactions, assets or earning power aggregating 50% or more of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person other than the Company or one or more of its wholly-owned
Subsidiaries, then, and in each such case, proper provision shall be made so
that (i) each holder of a Right (except as

                                      -14-
<PAGE>

otherwise provided herein) shall thereafter have the right to receive, upon the
exercise thereof at a price equal to the then current Purchase Price multiplied
by the number of one one-hundredths of a Preferred Share for which a Right is
then exercisable, in accordance with the terms of this Agreement and in lieu of
Preferred Shares, such number of Common Shares of such other Person (including
the Company as successor thereto or as the surviving corporation) as shall equal
the result obtained by (A) multiplying the then current Purchase Price by the
number of one one-hundredths of a Preferred Share for which a Right is then
exercisable and dividing that product by (B) 50% of the then current per share
market price of the Common Shares of such other Person (determined pursuant to
Section 11(d) hereof) on the date of consummation of such consolidation, merger,
sale or transfer; (ii) the issuer of such Common Shares shall thereafter be
liable for, and shall assume, by virtue of such consolidation, merger, sale or
transfer, all the obligations and duties of the Company pursuant to this
Agreement; (iii) the term "Company" shall thereafter be deemed to refer to such
issuer; and (iv) such issuer shall take such steps (including, but not limited
to, the reservation of a sufficient number of its Common Shares in accordance
with Section 9 hereof) in connection with such consummation as may be necessary
to assure that the provisions hereof shall thereafter be applicable, as nearly
as reasonably may be, in relation to the Common Shares of the Company thereafter
deliverable upon the exercise of the Rights. The Company shall not consummate
any such consolidation, merger, sale or transfer unless, prior thereto, the
Company and such issuer shall have executed and delivered to the Rights Agent a
supplemental agreement so providing. The Company shall not enter into any
transaction of the kind referred to in this Section 13 if at the time of such
transaction there are any rights, warrants, instruments or securities
outstanding or any agreements or arrangements which, as a result of the
consummation of such transaction, would eliminate or substantially diminish the
benefits intended to be afforded by the Rights. The provisions of this Section
13 shall similarly apply to successive mergers or consolidations or sales or
other transfers.

            Section 14. Fractional Rights and Fractional Shares. (a) The Company
shall not be required to issue fractions of Rights or to distribute Right
Certificates which evidence fractional Rights. In lieu of such fractional
Rights, there shall be paid to the registered holders of the Right Certificates
with regard to which such fractional Rights would otherwise be issuable, an
amount in cash equal to the same fraction of the current market value of a whole
Right. For the purposes of this Section 14(a), the current market value of a
whole Right shall be the closing price of the Rights for the Trading Day
immediately prior to the date on which such fractional Rights would have been
otherwise issuable. The closing price for any day shall be the last sale price,
regular way, or, in case no such sale takes place on such day, the average of
the closing bid and asked prices, regular way, in either case, as reported in
the principal consolidated transaction reporting system with respect to
securities listed on the principal national securities exchange on which the
Rights are listed or admitted to trading or, if the Rights are not listed or
admitted to trading on any national securities exchange, the last quoted price
or, if not so quoted, the average of the high bid and low asked prices in the
over-the-counter market, as reported by NASDAQ or such other system then in use
or, if on any such date the Rights are not quoted by any such organization, the
average of the closing bid and asked prices as furnished by a professional
market maker making a market in the Rights selected by the Board of Directors of
the Company. If on any such date no such market maker is making a market in the
Rights, the fair value of the Rights on such date as determined in good faith by
the Board of Directors of the Company shall be used.

                                      -15-
<PAGE>

            (b) The Company shall not be required to issue fractions of
Preferred Shares (other than fractions which are integral multiples of one
one-hundredth of a Preferred Share) upon exercise of the Rights or to distribute
certificates which evidence fractional Preferred Shares (other than fractions
which are integral multiples of one one-hundredth of a Preferred Share).
Fractions of Preferred Shares in integral multiples of one one-hundredth of a
Preferred Share may, at the election of the Company, be evidenced by depositary
receipts, pursuant to an appropriate agreement between the Company and a
depositary selected by it; provided that such agreement shall provide that the
holders of such depositary receipts shall have all the rights, privileges and
preferences to which they are entitled as beneficial owners of the Preferred
Shares represented by such depositary receipts. In lieu of fractional Preferred
Shares that are not integral multiples of one one-hundredth of a Preferred
Share, the Company shall pay to the registered holders of Right Certificates at
the time such Rights are exercised as herein provided an amount in cash equal to
the same fraction of the current market value of one Preferred Share. For the
purposes of this Section 14(b), the current market value of a Preferred Share
shall be the closing price of a Preferred Share (as determined pursuant to the
second sentence of Section 11(d)(i) hereof) for the Trading Day immediately
prior to the date of such exercise.

            (c) The holder of a Right, by the acceptance of the Right, expressly
waives such holder's right to receive any fractional Rights or any fractional
shares upon exercise of a Right (except as provided above).

            Section 15. Rights of Action. All rights of action in respect of
this Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Right
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Right Certificate (or, prior to
the Distribution Date, of the Common Shares), without the consent of the Rights
Agent or of the holder of any other Right Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in such holder's own behalf and
for such holder's own benefit, enforce, and may institute and maintain any suit,
action or proceeding against the Company to enforce, or otherwise act in respect
of, such holder's right to exercise the Rights evidenced by such Right
Certificate in the manner provided in such Right Certificate and in this
Agreement. Without limiting the foregoing or any remedies available to the
holders of Rights, it is specifically acknowledged that the holders of Rights
would not have an adequate remedy at law for any breach of this Agreement, and
will be entitled to specific performance of the obligations under, and
injunctive relief against actual or threatened violations of the obligations of
any Person subject to, this Agreement.

            Section 16. Agreement of Right Holders. Every holder of a Right, by
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

            (a) prior to the Distribution Date, the Rights will be transferable
only in connection with the transfer of the Common Shares;

            (b) after the Distribution Date, the Right Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the principal office of the Rights Agent, duly endorsed or accompanied by a
proper instrument of transfer; and

                                      -16-
<PAGE>

            (c) the Company and the Rights Agent may deem and treat the person
in whose name the Right Certificate (or, prior to the Distribution Date, the
associated Common Shares certificate) is registered as the absolute owner
thereof and of the Rights evidenced thereby (notwithstanding any notations of
ownership or writing on the Right Certificate or the associated Common Shares
certificate made by anyone other than the Company or the Rights Agent) for all
purposes whatsoever, and neither the Company nor the Rights Agent shall be
affected by any notice to the contrary.

            Section 17. Right Certificate Holder Not Deemed a Shareholder. No
holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Shares or any
other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a shareholder of the Company or any
right to vote for the election of directors or upon any matter submitted to
shareholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
shareholders (except as provided in Section 25 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Right Certificate shall have been exercised in accordance with the
provisions hereof.

            Section 18. Concerning the Rights Agent. The Company agrees to pay
to the Rights Agent reasonable compensation for all services rendered by it
hereunder, and, from time to time, on demand of the Rights Agent, its reasonable
expenses and counsel fees and other disbursements incurred in the administration
and execution of this Agreement and the exercise and performance of its duties
hereunder. The Company also agrees to indemnify the Rights Agent for, and to
hold it harmless against, any loss, liability, or expense incurred without
negligence, bad faith or willful misconduct on the part of the Rights Agent, for
anything done or omitted by the Rights Agent in connection with the acceptance
and administration of this Agreement, including the costs and expenses of
defending against any claim of liability in the premises.

            The Rights Agent shall be protected and shall incur no liability
for, or in respect of any action taken, suffered or omitted by it in connection
with, its administration of this Agreement in reliance upon any Right
Certificate or certificate for the Preferred Shares or Common Shares or for
other securities of the Company, instrument of assignment or transfer, power of
attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement, or other paper or document believed by it to be genuine
and to be signed, executed and, where necessary, verified or acknowledged, by
the proper person or persons, or otherwise upon the advice of counsel as set
forth in Section 20 hereof.

            Section 19. Merger or Consolidation or Change of Name of Rights
Agent. Any corporation into which the Rights Agent or any successor Rights Agent
may be merged or with which it may be consolidated, or any corporation resulting
from any merger or consolidation to which the Rights Agent or any successor
Rights Agent shall be a party, or any corporation succeeding to the stock
transfer or corporate trust powers of the Rights Agent or any successor Rights
Agent, shall be the successor to the Rights Agent under this Agreement without
the execution or filing of any paper or any further act on the part of any of
the parties hereto;

                                      -17-
<PAGE>

provided that such corporation would be eligible for appointment as a successor
Rights Agent under the provisions of Section 21 hereof. In case at the time such
successor Rights Agent shall succeed to the agency created by this Agreement,
any of the Right Certificates shall have been countersigned but not delivered,
any such successor Rights Agent may adopt the countersignature of the
predecessor Rights Agent and deliver such Right Certificates so countersigned;
and, in case at that time any of the Right Certificates shall not have been
countersigned, any successor Rights Agent may countersign such Right
Certificates either in the name of the predecessor Rights Agent or in the name
of the successor Rights Agent; and, in all such cases, such Right Certificates
shall have the full force provided in the Right Certificates and in this
Agreement.

            In case at any time the name of the Rights Agent shall be changed
and at such time any of the Right Certificates shall have been countersigned but
not delivered, the Rights Agent may adopt the countersignature under its prior
name and deliver Right Certificates so countersigned; and, in case at that time
any of the Right Certificates shall not have been countersigned, the Rights
Agent may countersign such Right Certificates either in its prior name or in its
changed name; and, in all such cases, such Right Certificates shall have the
full force provided in the Right Certificates and in this Agreement.

            Section 20. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Right Certificates,
by their acceptance thereof, shall be bound:

            (a) The Rights Agent may consult with legal counsel (who may be
legal counsel for the Company), and the opinion of such counsel shall be full
and complete authorization and protection to the Rights Agent as to any action
taken or omitted by it in good faith and in accordance with such opinion.

            (b) Whenever in the performance of its duties under this Agreement
the Rights Agent shall deem it necessary or desirable that any fact or matter be
proved or established by the Company prior to taking or suffering any action
hereunder, such fact or matter (unless other evidence in respect thereof be
herein specifically prescribed) may be deemed to be conclusively proved and
established by a certificate signed by any one of the Chairman of the Board, the
Chief Executive Officer, the President, any Vice President or the Secretary of
the Company and delivered to the Rights Agent; and such certificate shall be
full authorization to the Rights Agent for any action taken or suffered in good
faith by it under the provisions of this Agreement in reliance upon such
certificate.

            (c) The Rights Agent shall be liable hereunder to the Company and
any other Person only for its own negligence, bad faith or willful misconduct.

            (d) The Rights Agent shall not be liable for or by reason of any of
the statements of fact or recitals contained in this Agreement or in the Right
Certificates (except its countersignature thereof) or be required to verify the
same, but all such statements and recitals are and shall be deemed to have been
made by the Company only.

                                      -18-
<PAGE>

            (e) The Rights Agent shall not be under any responsibility in
respect of the validity of this Agreement or the execution and delivery hereof
(except the due execution hereof by the Rights Agent) or in respect of the
validity or execution of any Right Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Right Certificate;
nor shall it be responsible for any change in the exercisability of the Rights
(including the Rights becoming void pursuant to Section 11(a)(ii) hereof) or any
adjustment in the terms of the Rights (including the manner, method or amount
thereof) provided for in Section 3, 11, 13, 23 or 24 hereof, or the ascertaining
of the existence of facts that would require any such change or adjustment
(except with respect to the exercise of Rights evidenced by Right Certificates
after actual notice that such change or adjustment is required); nor shall it by
any act hereunder be deemed to make any representation or warranty as to the
authorization or reservation of any Preferred Shares to be issued pursuant to
this Agreement or any Right Certificate or as to whether any Preferred Shares
will, when issued, be validly authorized and issued, fully paid and
nonassessable.

            (f) The Company agrees that it will perform, execute, acknowledge
and deliver or cause to be performed, executed, acknowledged and delivered all
such further and other acts, instruments and assurances as may reasonably be
required by the Rights Agent for the carrying out or performing by the Rights
Agent of the provisions of this Agreement.

            (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the Chief Executive Officer, the President,
any Vice President or the Secretary of the Company, and to apply to such
officers for advice or instructions in connection with its duties, and it shall
not be liable for any action taken or suffered by it in good faith in accordance
with instructions of any such officer or for any delay in acting while waiting
for those instructions.

            (h) The Rights Agent and any shareholder, director, officer or
employee of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or contract with or lend money to the
Company or otherwise act as fully and freely as though it were not Rights Agent
under this Agreement. Nothing herein shall preclude the Rights Agent from acting
in any other capacity for the Company or for any other legal entity.

            (i) The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the Company resulting from any such act, default,
neglect or misconduct, provided that reasonable care was exercised in the
selection and continued employment thereof.

            Section 21. Change of Rights Agent. The Rights Agent or any
successor Rights Agent may resign and be discharged from its duties under this
Agreement upon 30 days' notice in writing mailed to the Company and to each
transfer agent of the Common Shares or Preferred Shares by registered or
certified mail, and to the holders of the Right Certificates by first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
30 days' notice in writing, mailed to the Rights Agent or successor Rights
Agent, as the

                                      -19-
<PAGE>

case may be, and to each transfer agent of the Common Shares or Preferred Shares
by registered or certified mail, and to the holders of the Right Certificates by
first-class mail. If the Rights Agent shall resign or be removed or shall
otherwise become incapable of acting, the Company shall appoint a successor to
the Rights Agent. If the Company shall fail to make such appointment within a
period of 30 days after giving notice of such removal or after it has been
notified in writing of such resignation or incapacity by the resigning or
incapacitated Rights Agent or by the holder of a Right Certificate (which holder
shall, with such notice, submit such holder's Right Certificate for inspection
by the Company), then the registered holder of any Right Certificate may apply
to any court of competent jurisdiction for the appointment of a new Rights
Agent. Any successor Rights Agent, whether appointed by the Company or by such a
court, shall be a corporation organized and doing business under the laws of the
United States or of the State of Colorado (or of any other state of the United
States so long as such corporation is authorized to do business as a banking
institution in the State of Colorado), in good standing, having an office in the
State of Colorado, which is authorized under such laws to exercise corporate
trust or stock transfer powers and is subject to supervision or examination by
federal or state authority and which has at the time of its appointment as
Rights Agent a combined capital and surplus of at least $50 million. After
appointment, the successor Rights Agent shall be vested with the same powers,
rights, duties and responsibilities as if it had been originally named as Rights
Agent without further act or deed; but the predecessor Rights Agent shall
deliver and transfer to the successor Rights Agent any property at the time held
by it hereunder, and execute and deliver any further assurance, conveyance, act
or deed necessary for the purpose. Not later than the effective date of any such
appointment, the Company shall file notice thereof in writing with the
predecessor Rights Agent and each transfer agent of the Common Shares or
Preferred Shares, and mail a notice thereof in writing to the registered holders
of the Right Certificates. Failure to give any notice provided for in this
Section 21, however, or any defect therein, shall not affect the legality or
validity of the resignation or removal of the Rights Agent or the appointment of
the successor Rights Agent, as the case may be.

            Section 22. Issuance of New Right Certificates. Notwithstanding any
of the provisions of this Agreement or of the Rights to the contrary, the
Company may, at its option, issue new Right Certificates evidencing Rights in
such form as may be approved by the Board of Directors of the Company to reflect
any adjustment or change in the Purchase Price and the number or kind or class
of shares or other securities or property purchasable under the Right
Certificates made in accordance with the provisions of this Agreement.

            Section 23. Redemption. (a) The Board of Directors of the Company
may, at its option, at any time prior to such time as any Person becomes an
Acquiring Person, redeem all but not less than all the then outstanding Rights
at a redemption price of $.01 per Right, appropriately adjusted to reflect any
stock split, stock dividend or similar transaction occurring after the date
hereof (such redemption price being hereinafter referred to as the "Redemption
Price"). The redemption of the Rights by the Board of Directors of the Company
may be made effective at such time, on such basis and with such conditions as
the Board of Directors of the Company, in its sole discretion, may establish.

            (b) Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights pursuant to paragraph (a) of this
Section 23, and without any further action and without any notice, the right to
exercise the Rights will terminate and the

                                      -20-

<PAGE>

only right thereafter of the holders of Rights shall be to receive the
Redemption Price. The Company shall promptly give public notice of any such
redemption; provided, however, that the failure to give, or any defect in, any
such notice shall not affect the validity of such redemption. Within 10 days
after such action of the Board of Directors of the Company ordering the
redemption of the Rights, the Company shall mail a notice of redemption to all
the holders of the then outstanding Rights at their last addresses as they
appear upon the registry books of the Rights Agent or, prior to the Distribution
Date, on the registry books of the transfer agent for the Common Shares. Any
notice which is mailed in the manner herein provided shall be deemed given,
whether or not the holder receives the notice. Each such notice of redemption
will state the method by which the payment of the Redemption Price will be made.
Neither the Company nor any of its Affiliates or Associates may redeem, acquire
or purchase for value any Rights at any time in any manner other than that
specifically set forth in this Section 23 or in Section 24 hereof, and other
than in connection with the purchase of Common Shares prior to the Distribution
Date.

            Section 24. Exchange. (a) The Board of Directors of the Company may,
at its option, at any time after any Person becomes an Acquiring Person,
exchange all or part of the then outstanding and exercisable Rights (which shall
not include Rights that have become void pursuant to the provisions of Section
11(a)(ii) hereof) for Common Shares at an exchange ratio of one Common Share per
Right, appropriately adjusted to reflect any adjustment in the number of Rights
pursuant to Section 11(i) (such exchange ratio being hereinafter referred to as
the "Exchange Ratio"). Notwithstanding the foregoing, the Board of Directors of
the Company shall not be empowered to effect such exchange at any time after any
Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or any such Subsidiary, or any entity holding Common
Shares for or pursuant to the terms of any such plan), together with all
Affiliates and Associates of such Person, becomes the Beneficial Owner of 50% or
more of the Common Shares then outstanding.

            (b) Immediately upon the action of the Board of Directors of the
Company ordering the exchange of any Rights pursuant to paragraph (a) of this
Section 24 and without any further action and without any notice, the right to
exercise such Rights shall terminate and the only right thereafter of a holder
of such Rights shall be to receive that number of Common Shares equal to the
number of such Rights held by such holder multiplied by the Exchange Ratio. The
Company shall promptly give public notice of any such exchange; provided,
however, that the failure to give, or any defect in, such notice shall not
affect the validity of such exchange. The Company promptly shall mail a notice
of any such exchange to all of the holders of such Rights at their last
addresses as they appear upon the registry books of the Rights Agent. Any notice
which is mailed in the manner herein provided shall be deemed given, whether or
not the holder receives the notice. Each such notice of exchange will state the
method by which the exchange of the Common Shares for Rights will be effected,
and, in the event of any partial exchange, the number of Rights which will be
exchanged. Any partial exchange shall be effected pro rata based on the number
of Rights (other than Rights which have become void pursuant to the provisions
of Section 11(a)(ii) hereof) held by each holder of Rights.

            (c) In the event that there shall not be sufficient Common Shares
issued but not outstanding or authorized but unissued to permit any exchange of
Rights as contemplated in accordance with this Section 24, the Company shall
take all such action as may be necessary to

                                      -21-
<PAGE>

authorize additional Common Shares for issuance upon exchange of the Rights. In
the event the Company shall, after good faith effort, be unable to take all such
action as may be necessary to authorize such additional Common Shares, the
Company shall substitute, for each Common Share that would otherwise be issuable
upon exchange of a Right, a number of Preferred Shares or fraction thereof such
that the current per share market price of one Preferred Share multiplied by
such number or fraction is equal to the current per share market price of one
Common Share as of the date of issuance of such Preferred Shares or fraction
thereof.

            (d) The Company shall not be required to issue fractions of Common
Shares or to distribute certificates which evidence fractional Common Shares. In
lieu of such fractional Common Shares, the Company shall pay to the registered
holders of the Right Certificates with regard to which such fractional Common
Shares would otherwise be issuable an amount in cash equal to the same fraction
of the current market value of a whole Common Share. For the purposes of this
paragraph (d), the current market value of a whole Common Share shall be the
closing price of a Common Share (as determined pursuant to the second sentence
of Section 11(d)(i) hereof) for the Trading Day immediately prior to the date of
exchange pursuant to this Section 24.

            Section 25. Notice of Certain Events. (a) In case the Company shall,
at any time after the Distribution Date, propose (i) to pay any dividend payable
in stock of any class to the holders of the Preferred Shares or to make any
other distribution to the holders of the Preferred Shares (other than a regular
quarterly cash dividend), (ii) to offer to the holders of the Preferred Shares
rights or warrants to subscribe for or to purchase any additional Preferred
Shares or shares of stock of any class or any other securities, rights or
options, (iii) to effect any reclassification of the Preferred Shares (other
than a reclassification involving only the subdivision of outstanding Preferred
Shares), (iv) to effect any consolidation or merger into or with, or to effect
any sale or other transfer (or to permit one or more of its Subsidiaries to
effect any sale or other transfer), in one or more transactions, of 50% or more
of the assets or earning power of the Company and its Subsidiaries (taken as a
whole) to, any other Person, (v) to effect the liquidation, dissolution or
winding up of the Company, or (vi) to declare or pay any dividend on the Common
Shares payable in Common Shares or to effect a subdivision, combination or
consolidation of the Common Shares (by reclassification or otherwise than by
payment of dividends in Common Shares), then, in each such case, the Company
shall give to each holder of a Right Certificate, in accordance with Section 26
hereof, a notice of such proposed action, which shall specify the record date
for the purposes of such stock dividend, or distribution of rights or warrants,
or the date on which such reclassification, consolidation, merger, sale,
transfer, liquidation, dissolution, or winding up is to take place and the date
of participation therein by the holders of the Common Shares and/or Preferred
Shares, if any such date is to be fixed, and such notice shall be so given in
the case of any action covered by clause (i) or (ii) above at least 10 days
prior to the record date for determining holders of the Preferred Shares for
purposes of such action, and, in the case of any such other action, at least 10
days prior to the date of the taking of such proposed action or the date of
participation therein by the holders of the Common Shares and/or Preferred
Shares, whichever shall be the earlier.

            (b) In case the event set forth in Section 11(a)(ii) hereof shall
occur, then the Company shall, as soon as practicable thereafter, give to each
holder of a Right Certificate, in accordance with Section 26 hereof, a notice of
the occurrence of such event, which notice shall

                                      -22-
<PAGE>

describe such event and the consequences of such event to holders of Rights
under Section 11(a)(ii) hereof.

            Section 26. Notices. Notices or demands authorized by this Agreement
to be given or made by the Rights Agent or by the holder of any Right
Certificate to or on the Company shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed (until another address is filed in
writing with the Rights Agent) as follows:

            W-H Energy Services, Inc.
            10370 Richmond Avenue, Suite 990
            Houston, Texas  77042
            Attention:  Corporate Secretary

Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Agreement to be given or made by the Company or by the holder of any
Right Certificate to or on the Rights Agent shall be sufficiently given or made
if sent by first-class mail, postage prepaid, addressed (until another address
is filed in writing with the Company) as follows:

            Computershare Trust Company, Inc.
            P.O. Box 1596
            Denver, Colorado  80201
            Attention:  Corporate Actions

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Right Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

            Section 27. Supplements and Amendments. The Company may from time to
time supplement or amend this Agreement without the approval of any holders of
Right Certificates in order to cure any ambiguity, to correct or supplement any
provision contained herein which may be defective or inconsistent with any other
provisions herein, or to make any other provisions with respect to the Rights
which the Company may deem necessary or desirable, any such supplement or
amendment to be evidenced by a writing signed by the Company and the Rights
Agent; provided, however, that, from and after such time as any Person becomes
an Acquiring Person, this Agreement shall not be amended in any manner which
would adversely affect the interests of the holders of Rights. Without limiting
the foregoing, the Company may at any time prior to such time as any Person
becomes an Acquiring Person amend this Agreement to lower the thresholds set
forth in Section 1(a) and 3(a) hereof to not less than 10% (the "Reduced
Threshold"); provided, however, that no Person who beneficially owns a number of
Common Shares equal to or greater than the Reduced Threshold shall become an
Acquiring Person unless such Person shall, after the public announcement of the
Reduced Threshold, increase its beneficial ownership of the then outstanding
Common Shares (other than as a result of an acquisition of Common Shares by the
Company) to an amount equal to or greater than the greater of (x) the Reduced
Threshold or (y) the sum of (i) the lowest beneficial ownership of such Person
as a percentage of the outstanding Common Shares as of any date on or after the
date of the public announcement of such Reduced Threshold plus (ii) .001%.

                                      -23-
<PAGE>

            Section 28. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

            Section 29. Benefits of this Agreement. Nothing in this Agreement
shall be construed to give to any Person other than the Company, the Rights
Agent and the registered holders of the Right Certificates (and, prior to the
Distribution Date, the Common Shares) any legal or equitable right, remedy or
claim under this Agreement; but this Agreement shall be for the sole and
exclusive benefit of the Company, the Rights Agent and the registered holders of
the Right Certificates (and, prior to the Distribution Date, the Common Shares).

            Section 30. Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated.

            Section 31. Governing Law. This Agreement and each Right Certificate
issued hereunder shall be deemed to be a contract made under the laws of the
State of Texas and for all purposes shall be governed by and construed in
accordance with the laws of such state applicable to contracts to be made and
performed entirely within such state.

            Section 32. Counterparts. This Agreement may be executed in any
number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

            Section 33. Descriptive Headings. Descriptive headings of the
several Sections of this Agreement are inserted for convenience only and shall
not control or affect the meaning or construction of any of the provisions
hereof.

                                      -24-
<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed and attested, all as of the day and year first above written.

Attest:                                W-H ENERGY SERVICES, INC.

By:   /s/ Jeffrey L. Tepera            By:   /s/ Kenneth T. White, Jr.
   ---------------------------------      -------------------------------------
   Name:  Jeffrey L. Tepera               Name:  Kenneth T. White, Jr.
   Title: Vice-President and              Title: President and
          Chief Financial Officer                Chief Executive Officer

Attest:                                COMPUTERSHARE TRUST
                                       COMPANY, INC.

By:   /s/ Debbi Sorheim                By:   /s/ Ian Yewor
   ---------------------------            ---------------------------
   Name:  Debbi Sorheim                   Name:  Ian Yewor
   Title: Controller                      Title: President

                                      -25-
<PAGE>
                                                                       Exhibit A

                                      FORM
                                       OF
                            STATEMENT OF DESIGNATIONS
                                       OF
                      SERIES A JUNIOR PARTICIPATING PREFERRED STOCK
                                       OF
                            W-H ENERGY SERVICES, INC.

                        (Pursuant to Article 2.13 of the
                         Texas Business Corporation Act)

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

            W-H Energy Services, Inc., a Texas corporation (hereinafter called
the "Corporation"), hereby certifies that pursuant to the authority contained in
Article Four of the its Restated Articles of Incorporation, and in accordance
with the provisions of Article 2.13 of the Texas Business Corporation Act (the
"Act"), the Board of Directors of the Corporation (the "Board") adopted at a
meeting duly called and held on May 6, 2002 the following resolution creating
and providing for a series of Preferred Stock as hereinafter described:

            BE IT RESOLVED, that pursuant to the authority granted to and vested
in the Board in accordance with the provisions of the Restated Articles of
Incorporation, the Board hereby creates a series of Preferred Stock, par value
$.01 per share, of the Corporation (the "Preferred Stock"), and hereby states
the designation and number of shares, and fixes the relative rights,
preferences, and limitations thereof as follows:

            Series A Junior Participating Preferred Stock:

            Section 1. Designation and Amount. The shares of such series shall
be designated as "Series A Junior Participating Preferred Stock" (the "Series A
Preferred Stock") and the number of shares constituting the Series A Preferred
Stock shall be 1,000,000. Such number of shares may be increased or decreased by
resolution of the Board of Directors; provided, that no decrease shall reduce
the number of shares of Series A Preferred Stock to a number less than the
number of shares then outstanding plus the number of shares reserved for
issuance upon the exercise of outstanding options, rights or warrants or upon
the conversion of any outstanding securities issued by the Corporation
convertible into Series A Preferred Stock.

            Section 2. Dividends and Distributions.

            (A) Subject to the rights of the holders of any shares of any series
      of Preferred Stock (or any similar stock) ranking prior and superior to
      the Series A Preferred Stock with respect to dividends, the holders of
      shares of Series A Preferred Stock, in preference to the holders of Common
      Stock, par value $0.0001 per share (the "Common Stock"), of the
      Corporation, and of any other junior stock, shall be entitled to receive,
      when, as and if declared by the Board of Directors out of funds legally
      available for the purpose, quarterly dividends payable in cash on the
      first day of March, June, September and December in each year (each such
      date being referred to herein as a "Quarterly Dividend

                                      A-1
<PAGE>

      Payment Date"), commencing on the first Quarterly Dividend Payment Date
      after the first issuance of a share or fraction of a share of Series A
      Preferred Stock, in an amount per share (rounded to the nearest cent)
      equal to the greater of (a) $1 or (b) subject to the provision for
      adjustment hereinafter set forth, 100 times the aggregate per share amount
      of all cash dividends, and 100 times the aggregate per share amount
      (payable in kind) of all non-cash dividends or other distributions, other
      than a dividend payable in shares of Common Stock or a subdivision of the
      outstanding shares of Common Stock (by reclassification or otherwise),
      declared on the Common Stock since the immediately preceding Quarterly
      Dividend Payment Date or, with respect to the first Quarterly Dividend
      Payment Date, since the first issuance of any share or fraction of a share
      of Series A Preferred Stock. In the event the Corporation shall at any
      time declare or pay any dividend on the Common Stock payable in shares of
      Common Stock, or effect a subdivision or combination or consolidation of
      the outstanding shares of Common Stock (by reclassification or otherwise
      than by payment of a dividend in shares of Common Stock) into a greater or
      lesser number of shares of Common Stock, then in each such case the amount
      to which holders of shares of Series A Preferred Stock were entitled
      immediately prior to such event under clause (b) of the preceding sentence
      shall be adjusted by multiplying such amount by a fraction, the numerator
      of which is the number of shares of Common Stock outstanding immediately
      after such event and the denominator of which is the number of shares of
      Common Stock that were outstanding immediately prior to such event.

            (B) The Corporation shall declare a dividend or distribution on the
      Series A Preferred Stock as provided in paragraph (A) of this Section
      immediately after it declares a dividend or distribution on the Common
      Stock (other than a dividend payable in shares of Common Stock); provided
      that, in the event no dividend or distribution shall have been declared on
      the Common Stock during the period between any Quarterly Dividend Payment
      Date and the next subsequent Quarterly Dividend Payment Date, a dividend
      of $1 per share on the Series A Preferred Stock shall nevertheless be
      payable on such subsequent Quarterly Dividend Payment Date.

            (C) Dividends shall begin to accrue and be cumulative on outstanding
      shares of Series A Preferred Stock from the Quarterly Dividend Payment
      Date next preceding the date of issue of such shares, unless the date of
      issue of such shares is prior to the record date for the first Quarterly
      Dividend Payment Date, in which case dividends on such shares shall begin
      to accrue from the date of issue of such shares, or unless the date of
      issue is a Quarterly Dividend Payment Date or is a date after the record
      date for the determination of holders of shares of Series A Preferred
      Stock entitled to receive a quarterly dividend and before such Quarterly
      Dividend Payment Date, in either of which events such dividends shall
      begin to accrue and be cumulative from such Quarterly Dividend Payment
      Date. Accrued but unpaid dividends shall not bear interest. Dividends paid
      on the shares of Series A Preferred Stock in an amount less than the total
      amount of such dividends at the time accrued and payable on such shares
      shall be allocated pro rata on a share-by-share basis among all such
      shares at the time outstanding. The Board of Directors may fix a record
      date for the determination of holders of shares of Series A Preferred
      Stock entitled to receive payment of a dividend or distribution

                                      A-2
<PAGE>

      declared thereon, which record date shall be not more than 60 days prior
      to the date fixed for the payment thereof.

            Section 3. Voting Rights. The holders of shares of Series A
Preferred Stock shall have the following voting rights:

            (A) Subject to the provision for adjustment hereinafter set forth,
      each share of Series A Preferred Stock shall entitle the holder thereof to
      100 votes on all matters submitted to a vote of the shareholders of the
      Corporation. In the event the Corporation shall at any time declare or pay
      any dividend on the Common Stock payable in shares of Common Stock, or
      effect a subdivision or combination or consolidation of the outstanding
      shares of Common Stock (by reclassification or otherwise than by payment
      of a dividend in shares of Common Stock) into a greater or lesser number
      of shares of Common Stock, then in each such case the number of votes per
      share to which holders of shares of Series A Preferred Stock were entitled
      immediately prior to such event shall be adjusted by multiplying such
      number by a fraction, the numerator of which is the number of shares of
      Common Stock outstanding immediately after such event and the denominator
      of which is the number of shares of Common Stock that were outstanding
      immediately prior to such event.

            (B) Except as otherwise provided herein, in any other Statement of
      Designations creating a series of Preferred Stock or any similar stock, or
      by law, the holders of shares of Series A Preferred Stock and the holders
      of shares of Common Stock and any other capital stock of the Corporation
      having general voting rights shall vote together as one class on all
      matters submitted to a vote of shareholders of the Corporation.

            (C) Except as set forth herein, or as otherwise provided by law,
      holders of Series A Preferred Stock shall have no special voting rights
      and their consent shall not be required (except to the extent they are
      entitled to vote with holders of Common Stock as set forth herein) for
      taking any corporate action.

            Section 4. Certain Restrictions.

            (A) Whenever quarterly dividends or other dividends or distributions
      payable on the Series A Preferred Stock as provided in Section 2 are in
      arrears, thereafter and until all accrued and unpaid dividends and
      distributions, whether or not declared, on shares of Series A Preferred
      Stock outstanding shall have been paid in full, the Corporation shall not:

                (i) declare or pay dividends, or make any other distributions,
            on any shares of stock ranking junior (either as to dividends or
            upon liquidation, dissolution or winding up) to the Series A
            Preferred Stock;

                (ii) declare or pay dividends, or make any other distributions,
            on any shares of stock ranking on a parity (either as to dividends
            or upon liquidation, dissolution or winding up) with the Series A
            Preferred Stock, except dividends paid ratably on the Series A
            Preferred Stock and all such parity stock on which

                                      A-3
<PAGE>

            dividends are payable or in arrears in proportion to the total
            amounts to which the holders of all such shares are then entitled;

                (iii) redeem or purchase or otherwise acquire for consideration
            shares of any stock ranking junior (either as to dividends or upon
            liquidation, dissolution or winding up) to the Series A Preferred
            Stock, provided that the Corporation may at any time redeem,
            purchase or otherwise acquire shares of any such junior stock in
            exchange for shares of any stock of the Corporation ranking junior
            (either as to dividends or upon dissolution, liquidation or winding
            up) to the Series A Preferred Stock; or

                (iv) redeem or purchase or otherwise acquire for consideration
            any shares of Series A Preferred Stock, or any shares of stock
            ranking on a parity with the Series A Preferred Stock, except in
            accordance with a purchase offer made in writing or by publication
            (as determined by the Board of Directors) to all holders of such
            shares upon such terms as the Board of Directors, after
            consideration of the respective annual dividend rates and other
            relative rights and preferences of the respective series and
            classes, shall determine in good faith will result in fair and
            equitable treatment among the respective series or classes.

            (B) The Corporation shall not permit any subsidiary of the
      Corporation to purchase or otherwise acquire for consideration any shares
      of stock of the Corporation unless the Corporation could, under paragraph
      (A) of this Section 4, purchase or otherwise acquire such shares at such
      time and in such manner.

            Section 5. Reacquired Shares. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and cancelled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued shares of
Preferred Stock and may be reissued as part of a new series of Preferred Stock
subject to the conditions and restrictions on issuance set forth herein, in the
Restated Articles of Incorporation, or in any other Statement of Designations
creating a series of Preferred Stock or any similar stock or as otherwise
required by law.

            Section 6. Liquidation, Dissolution or Winding Up. Upon any
liquidation, dissolution or winding up of the Corporation, no distribution shall
be made (1) to the holders of shares of stock ranking junior (either as to
dividends or upon liquidation, dissolution or winding up) to the Series A
Preferred Stock unless, prior thereto, the holders of shares of Series A
Preferred Stock shall have received $100 per share, plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not declared,
to the date of such payment, provided that the holders of shares of Series A
Preferred Stock shall be entitled to receive an aggregate amount per share,
subject to the provision for adjustment hereinafter set forth, equal to 100
times the aggregate amount to be distributed per share to holders of shares of
Common Stock, or (2) to the holders of shares of stock ranking on a parity
(either as to dividends or upon liquidation, dissolution or winding up) with the
Series A Preferred Stock, except distributions made ratably on the Series A
Preferred Stock and all such parity stock in proportion to the total amounts to
which the holders of all such shares are entitled upon such liquidation,
dissolution or winding up. In the event the Corporation shall at any time
declare or pay any dividend on the

                                      A-4
<PAGE>

Common Stock payable in shares of Common Stock, or effect a subdivision or
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the aggregate amount to which holders of shares of Series A Preferred
Stock were entitled immediately prior to such event under the proviso in clause
(1) of the preceding sentence shall be adjusted by multiplying such amount by a
fraction the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.

            Section 7. Consolidation, Merger, etc. In case the Corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case each share of
Series A Preferred Stock shall at the same time be similarly exchanged or
changed into an amount per share, subject to the provision for adjustment
hereinafter set forth, equal to 100 times the aggregate amount of stock,
securities, cash and/or any other property (payable in kind), as the case may
be, into which or for which each share of Common Stock is changed or exchanged.
In the event the Corporation shall at any time declare or pay any dividend on
the Common Stock payable in shares of Common Stock, or effect a subdivision or
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the amount set forth in the preceding sentence with respect to the
exchange or change of shares of Series A Preferred Stock shall be adjusted by
multiplying such amount by a fraction, the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

            Section 8. No Redemption. The shares of Series A Preferred Stock
shall not be redeemable.

            Section 9. Rank. The Series A Preferred Stock shall rank, with
respect to the payment of dividends and the distribution of assets, junior to
all series of any other class of the Corporation's Preferred Stock.

            Section 10. Amendment. Neither the Restated Articles of
Incorporation of the Corporation or this Statement of Designations shall be
amended in any manner which would materially alter or change the powers,
preferences or special rights of the Series A Preferred Stock so as to affect
them adversely without the affirmative vote of the holders of at least
two-thirds of the outstanding shares of Series A Preferred Stock, voting
together as a single class.

                                      A-5
<PAGE>

            IN WITNESS WHEREOF, this Statement of Designations is executed on
behalf of the Corporation by its President and Chief Executive Officer and
attested by its Secretary this day of May, 2002.

                                          --------------------------------------
                                          Kenneth T. White, Jr.
                                          President and Chief Executive Officer

                                      A-6
<PAGE>
                                                                       Exhibit B

                            FORM OF RIGHT CERTIFICATE

Certificate No. R-                                                Rights
                                                            -----

            NOT EXERCISABLE AFTER JUNE 6, 2012 OR EARLIER IF REDEMPTION OR
            EXCHANGE OCCURS. THE RIGHTS ARE SUB- JECT TO REDEMPTION AT $.01 PER
            RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE AGREEMENT.

                                Right Certificate

                                W-H ENERGY SERVICES, INC.

            This certifies that __________, or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement, dated as of May 31, 2002 (the "Agreement"), between W-H Energy
Services, Inc., a Texas corporation (the "Company"), Computershare Trust
Company, Inc. (the "Rights Agent"), to purchase from the Company at any time
after the Distribution Date (as such term is defined in the Agreement) and prior
to 5:00 P.M., Denver time, on June 6, 2012 at the principal office of the Rights
Agent, or at the office of its successor as Rights Agent, one one-hundredth of a
fully paid non-assessable share of Series A Junior Participating Preferred
Stock, par value $.01 per share, of the Company (the "Preferred Shares"), at a
purchase price of $110 per one one-hundredth of a Preferred Share (the "Purchase
Price"), upon presentation and surrender of this Right Certificate with the Form
of Election to Purchase duly executed. The number of Rights evidenced by this
Right Certificate (and the number of one one-hundredths of a Preferred Share
which may be purchased upon exercise hereof) set forth above, and the Purchase
Price set forth above, are the number and Purchase Price as of June 6, 2002,
based on the Preferred Shares as constituted at such date. As provided in the
Agreement, the Purchase Price and the number of one one-hundredths of a
Preferred Share which may be purchased upon the exercise of the Rights evidenced
by this Right Certificate are subject to modification and adjustment upon the
happening of certain events.

            This Right Certificate is subject to all of the terms, provisions
and conditions of the Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Right Certificates. Copies of
the Agreement are on file at the principal executive offices of the Company and
the offices of the Rights Agent.

            This Right Certificate, with or without other Right Certificates,
upon surrender at the principal office of the Rights Agent, may be exchanged for
another Right Certificate or Right Certificates of like tenor and date
evidencing Rights entitling the holder to purchase a like aggregate number of
Preferred Shares as the Rights evidenced by the Right Certificate or Right
Certificates surrendered shall have entitled such holder to purchase. If this
Right Certificate shall be exercised in part, the holder shall be entitled to
receive upon surrender hereof another Right Certificate or Right Certificates
for the number of whole Rights not exercised.

                                      B-1
<PAGE>

            Subject to the provisions of the Agreement, the Rights evidenced by
this Right Certificate (i) may be redeemed by the Company at a redemption price
of $.01 per Right or (ii) may be exchanged in whole or in part for Preferred
Shares or shares of the Company's Common Stock, par value $0.0001 per share.

            No fractional Preferred Shares will be issued upon the exercise of
any Right or Rights evidenced hereby (other than fractions which are integral
multiples of one one-hundredth of a Preferred Share, which may, at the election
of the Company, be evidenced by depositary receipts), but, in lieu thereof, a
cash payment will be made, as provided in the Agreement.

            No holder of this Right Certificate shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of the Preferred
Shares or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Agreement
or herein be construed to confer upon the holder hereof, as such, any of the
rights of a shareholder of the Company or any right to vote for the election of
directors or upon any matter submitted to shareholders at any meeting thereof,
or to give or withhold consent to any corporate action, or to receive notice of
meetings or other actions affecting shareholders (except as provided in the
Agreement), or to receive dividends or subscription rights, or otherwise, until
the Right or Rights evidenced by this Right Certificate shall have been
exercised as provided in the Agreement.

            This Right Certificate shall not be valid or obligatory for any
purpose until it shall have been countersigned by the Rights Agent.

            WITNESS the facsimile signature of the proper officers of the
Company and its corporate seal.

Dated as of           ,     .
            ----------  ----

Attest:                                   W-H ENERGY SERVICES, INC.

By:                                       By:
   ---------------------------------         -----------------------------------
   Name:  Jeffrey L. Tepera                  Name:  Kenneth T. White, Jr.
   Title: Vice-President and                 Title: President and
          Chief Financial Officer                   Chief Executive Officer

Countersigned:

COMPUTERSHARE TRUST COMPANY, INC.

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

                    Form of Reverse Side of Right Certificate

                                      B-2
<PAGE>

                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Right Certificate.)

            FOR VALUE RECEIVED _______________________ hereby sells, assigns and

transfers unto _________________________________________________________________

________________________________________________________________________________
                  (Please print name and address of transferee)

________________________________________________________________________________
this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint Attorney, to transfer the within
Right Certificate on the books of the within-named Company, with full power of
substitution.

Dated:
      --------------------------

                                    --------------------------------------------
                                    Signature

Signature Guaranteed:

            Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.

            The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Agreement).

                                    --------------------------------------------
                                    Signature

             Form of Reverse Side of Right Certificate -- continued

                                      B-3
<PAGE>

                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise
                  Rights represented by the Right Certificate.)

To:  W-H ENERGY SERVICES, INC.

            The undersigned hereby irrevocably elects to exercise ______________
Rights represented by this Right Certificate to purchase the Preferred Shares
issuable upon the exercise of such Rights and requests that certificates for
such Preferred Shares be issued in the name of:

Please insert social security
or other identifying number

--------------------------------------------------------------------------------
                         (Please print name and address)

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

If such number of Rights shall not be all the Rights evidenced by this Right
Certificate, a new Right Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number

--------------------------------------------------------------------------------
                         (Please print name and address)

Dated:
        ------------------

                                                ------------------------------
                                                Signature
Signature Guaranteed:

            The signature(s) should be guaranteed by an eligible guarantor
institution (banks, stockbrokers, savings and loan associations and credit
unions with membership in an approved signature guarantee Medallion Program),
pursuant to Rule 17Ad-15 promulgated under the Securities and Exchange Act of
1934, as amended.

            The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Agreement).

                                    -------------------------------------
                                    Signature

                                      B-4
<PAGE>
                                     NOTICE

            The signature in the Form of Assignment or Form of Election to
Purchase, as the case may be, must conform to the name as written upon the face
of this Right Certificate in every particular, without alteration or enlargement
or any change whatsoever.

            In the event the certification set forth above in the Form of
Assignment or the Form of Election to Purchase, as the case may be, is not
completed, the Company and the Rights Agent will deem the beneficial owner of
the Rights evidenced by this Right Certificate to be an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Agreement) and such Assignment
or Election to Purchase will not be honored.

                                      B-5
<PAGE>
                                                                       Exhibit C

                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES

INTRODUCTION

      On May 6, 2002, the Board of Directors of W-H Energy Services, Inc., a
Texas corporation (the "Company"), declared a dividend of one preferred share
purchase right (a "Right") for each outstanding share of common stock, par value
$0.0001 per share. The dividend is payable on June 6, 2002 to the shareholders
of record on June 6, 2002.

      These Rights, which are governed by a Rights Agreement dated May 31, 2002
between the Company and Computershare Trust Company, Inc., as Rights Agent,
protect shareholders from coercive or otherwise unfair takeover tactics. In
general terms, it works by imposing a significant penalty upon any person or
group which acquires 20% or more of our outstanding common stock without the
approval of our Board. The Rights Agreement should not interfere with any merger
or other business combination approved by our Board.

      For those interested in the specific terms of the Rights Agreement, we
provide the following summary description. Please note, however, that this
description is only a summary, is not complete and should be read together with
the entire Rights Agreement, which has been filed as an exhibit hereto. A copy
of the agreement is available free of charge from the Company.

THE RIGHTS. Our Board authorized the issuance of a Right with respect to each
outstanding share of common stock on June 6, 2002. The Rights will initially
trade with, and will be inseparable from, the common stock. The Rights are
evidenced only by certificates that represent shares of common stock. New Rights
will accompany any new shares of common stock we issue after June 6, 2002 until
the Distribution Date described below.

EXERCISE PRICE. Each Right will allow its holder to purchase from the Company
one one-hundredth of a share of Series A Junior Participating Preferred Stock
("Preferred Share") for $110, once the Rights become exercisable. This portion
of a Preferred Share will give the shareholder approximately the same dividend,
voting and liquidation rights as would one share of common stock. Prior to
exercise, the Right does not give its holder any dividend, voting, or
liquidation rights.

EXERCISABILITY. The Rights will not be exercisable until

o  10 days after the public announcement that a person or group has become an
   "Acquiring Person" by obtaining beneficial ownership of 20% or more of our
   outstanding common stock, or, if earlier,

o  10 business days (or a later date determined by our Board before any person
   or group becomes an Acquiring Person) after a person or group begins a tender
   or exchange offer which, if completed, would result in that person or group
   becoming an Acquiring Person.

      We refer to the date when the Rights become exercisable as the
"Distribution Date." Until that date, the common stock certificates will also
evidence the Rights, and any transfer of

                                      C-1
<PAGE>

shares of common stock will constitute a transfer of Rights. After that date,
the Rights will separate from the common stock and be evidenced by book-entry
credits or by Rights certificates that we will mail to all eligible holders of
common stock. Any Rights held by an Acquiring Person are void and may not be
exercised.

CONSEQUENCES OF A PERSON OR GROUP BECOMING AN ACQUIRING PERSON.

o  Flip In. If a person or group becomes an Acquiring Person, all holders of
   Rights except the Acquiring Person may, for $110, purchase shares of our
   common stock with a market value of $220, based on the market price of the
   common stock prior to such acquisition.

o  Flip Over. If the Company is later acquired in a merger or similar
   transaction after the Rights Distribution Date, all holders of Rights except
   the Acquiring Person may, for $110, purchase shares of the acquiring
   corporation with a market value of $220 based on the market price of the
   acquiring corporation's stock, prior to such merger.

PREFERRED SHARE PROVISIONS.

Each one one-hundredth of a Preferred Share, if issued:

o  will not be redeemable.

o  will entitle holders to quarterly dividend payments of $.01 per share, or an
   amount equal to the dividend paid on one share of common stock, whichever is
   greater.

o  will entitle holders upon liquidation either to receive $1 per share or an
   amount equal to the payment made on one share of common stock, whichever is
   greater.

o  will have the same voting power as one share of common stock.

o  if shares of our common stock are exchanged via merger, consolidation, or a
   similar transaction, will entitle holders to a per share payment equal to the
   payment made on one share of common stock.

The value of a one one-hundredth interest in a Preferred Share should
approximate the value of one share of common stock.

EXPIRATION.  The Rights will expire on June 6, 2012.

REDEMPTION. Our Board may redeem the Rights for $.01 per Right at any time
before any person or group becomes an Acquiring Person. If our Board redeems any
Rights, it must redeem all of the Rights. Once the Rights are redeemed, the only
right of the holders of Rights will be to receive the redemption price of $.01
per Right. The redemption price will be adjusted if we have a stock split or
stock dividends of our common stock.

EXCHANGE. After a person or group becomes an Acquiring Person, but before an
Acquiring Person owns 50% or more of our outstanding common stock, our Board may
extinguish the

                                      C-2
<PAGE>

Rights by exchanging one share of common stock or an equivalent
security for each Right, other than Rights held by the Acquiring Person.

ANTI-DILUTION PROVISIONS. Our Board may adjust the purchase price of the
Preferred Shares, the number of Preferred Shares issuable and the number of
outstanding Rights to prevent dilution that may occur from a stock dividend, a
stock split, a reclassification of the Preferred Shares or common stock. No
adjustments to the Exercise Price of less than 1% will be made.

AMENDMENTS. The terms of the Rights Agreement may be amended by our Board
without the consent of the holders of the Rights. In addition, the Board may not
cause a person or group to become an Acquiring Person by lowering this threshold
below the percentage interest that such person or group already owns. After a
person or group becomes an Acquiring Person, our Board may not amend the
agreement in a way that adversely affects holders of the Rights.

                                      C-3

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