Exhibit  4.21 -  Confirmation  of and  Amendment  to  Security  Agreement  Dated
September 18, 2001


                                    EXHIBIT D
               CONFIRMATION OF AND AMENDMENT TO SECURITY AGREEMENT


         In connection  with the Credit  Agreement dated September 18, 2001 (the
"Credit  Agreement"),  among Casting Technology Company (the "Company") and Bank
One, Indiana,  National  Association ("Bank One"), the Company acknowledges that
it has previously  executed and delivered a Security  Agreement dated as of July
28, 1995 (the "Security Agreement") in favor of Bank One, successor by merger to
NBD Bank, NA, assignee of NBD Bank, a Michigan banking corporation.

     The Company further  acknowledges that the Company's  indebtedness to Asahi
Bank, Ltd. has been satisfied.

         The Company confirms to Bank One the continuing  effect of the Security
Agreement as security for the payment and performance of all Secured Obligations
(as defined in the Security Agreement), now or hereafter owing by the Company to
Bank One,  including  without  limitation  the debt  arising  under  the  Credit
Agreement.

         As a condition to the effectiveness of Bank One's obligations under the
Credit Agreement, the Company agrees as follows:

          1. To secure  (a) the prompt and  complete  payment of any  promissory
notes issued by the Company pursuant to the Credit Agreement (the "Notes"),  (b)
the  performance of the covenants  herein  contained and any monies  expended by
Bank  One in  connection  therewith,  (c) the  payment  of all  obligations  and
performance  of all covenants of the Company under the Credit  Agreement and any
other documents,  agreements or instruments among the Company and Bank One given
in connection therewith, and (d) any and all other indebtedness, obligations and
liabilities  of any kind of the Company to Bank One now or  hereafter  existing,
direct or indirect  (including  without  limitation any  participation  interest
acquired by any Bank in any such indebtedness, obligations or liabilities of the
Company to any other  person),  absolute or  contingent,  joint and/or  several,
secured or  unsecured,  arising by  operation of law or  otherwise,  and whether
incurred by the Company as principal, surety, endorser, guarantor, accommodation
party  or  otherwise  (all  of  the  aforesaid  indebtedness,   obligations  and
liabilities  of the Company being herein called the "Secured  Obligations",  and
all of the documents,  agreements and instruments among the Company and Bank One
evidencing or securing the repayment of, or otherwise  pertaining to the Secured
Obligations being herein  collectively  called the "Operative  Documents"),  for
value received and pursuant to the Credit Agreement,  the Company hereby grants,
assigns and transfers to Bank One a first-priority  security  interest in and to
the following  described  property,  whether now owned or hereafter acquired and
wherever located (collectively, the "Collateral").

         (a) All machinery and equipment now owned or hereafter acquired (except
for machinery and equipment acquired under an operating lease), whether located,
and whether used by the Company or any other person, or leased by the Company to
any person and whether the interest of Company is as owner, lessee or otherwise;


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         (b)      Accounts, inventory and general intangibles; and

         (c) All products and all proceeds of any and all of the foregoing, and,
to the extent not otherwise  included,  all payments under insurance (whether or
not the  Agent  is the loss  payee  thereof),  and any  indemnity,  warranty  or
guaranty,  payable by reason of loss or damage to or  otherwise  with respect to
any of the foregoing;

         2. The  Security  Agreement is amended by deleting the phrase on page 2
which states as follows,  "provided,  however,  that any machinery and equipment
purchased solely with proceeds of indebtedness permitted under Section 5.2(a)(v)
of the  Credit  Agreement  shall  not  constitute  Collateral  so  long  as such
indebtedness is outstanding.'

         3. All  references  to the terms "Agent" or "the Banks" in the Security
Agreement  are  hereby  replaced  with  "Bank  One." The  defined  term  "Credit
Agreement" shall be amended to include the Credit Agreement,  defined above, and
all amendments and modifications thereto.

         4. The Company is and  continues  to be  obligated  under the  Security
Agreement, specifically Paragraphs 1 through 14 thereof.

         IN WITNESS WHEREOF, the undersigned has duly executed this Confirmation
and Amendment as of September 18th , 2001.


                            CASTING TECHNOLOGY COMPANY

                            By: AMCAST CASTING TECHNOLOGIES, INC.
                            Its General Partner

                            By:   /s/ Francis J. Drew
                            Its:      Vice President

                            And

                            By: IZUMI, INC.
                            Its General Partner

                            By:   /s/ Francis J. Drew
                            Its:      Vice President