AMENDMENT TO RIGHTS AGREEMENT


            AMENDMENT,  dated as of September 9, 1999, to the Rights  Agreement,
dated as of November 6, 1996 by and between  Premark  International,  Inc.  (the
"Company")  and Norwest Bank  Minnesota,  N.A. (as Rights Agent) (as  heretofore
amended, the "Rights Agreement").

            WHEREAS, the Company and the Rights Agent have heretofore
executed and entered into the Rights Agreement; and

            WHEREAS, pursuant to Section 27 of the Rights Agreement, the Company
may from time to time  supplement  or amend the Rights  Agreement in  accordance
with the provisions of Section 27 thereof; and

            WHEREAS,  the Company intends to enter into an Agreement and Plan of
Merger (as it may be  amended or  supplemented  from time to time,  the  "Merger
Agreement"),  dated as of September 9, 1999, among the Company and Illinois Tool
Works  Inc.  ("Parent")  and CS  Merger  Sub Inc.  ("Sub"),  and a Stock  Option
Agreement (as it may be amended or  supplemented  from time to time,  the "Stock
Option  Agreement"),  dated as of  September  9, 1999,  between  the Company and
Parent (all capitalized  terms used in this Amendment and not otherwise  defined
herein shall have the meaning ascribed thereto in the Merger Agreement); and

            WHEREAS,  the Board of Directors has determined  that the Merger and
the other  transactions  contemplated by the Merger Agreement are fair to and in
the best interests of the Company and its stockholders; and

            WHEREAS,  the Board of Directors has determined that it is desirable
to amend the  Rights  Agreement  to exempt the  Merger  Agreement  and the Stock
Option Agreement and the transactions  contemplated thereby from the application
of the Rights Agreement.

            NOW,  THEREFORE,  the Company hereby amends the Rights  Agreement as
follows:

            1.  Section  1(a) of the Rights  Agreement  is hereby  modified  and
amended by adding the following sentence at the end thereof:

            Notwithstanding  the  foregoing,  neither  Illinois  Tool Works Inc.
            ("Parent") nor CS Merger Sub Inc. ("Sub"),  shall be deemed to be an
            Acquiring  Person by virtue of the  execution  and  delivery  of the
            Agreement and Plan of Merger (the "Merger  Agreement") to be entered
            into as of September 9, 1999, among the Company,  Parent and Sub, or
            the Stock Option  Agreement  (the "Stock  Option  Agreement")  to be
            entered  into as of  September  9, 1999,  between  the  Company  and
            Parent,  or as a  result  of the  consummation  of the  transactions
            contemplated by the Merger Agreement or the Stock Option Agreement."



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            2.  Section  1(l) of the Rights  Agreement  is hereby  modified  and
amended by adding the following sentence at the end thereof:

            "Neither the execution  and delivery of the Merger  Agreement or the
            Stock  Option  Agreement,   nor  consummation  of  the  transactions
            contemplated by the Merger Agreement or the Stock Option  Agreement,
            shall cause a Shares Acquisition Date."

            3.  Section  3(a) of the Rights  Agreement  is hereby  modified  and
amended to add the following sentence  immediately  following the first sentence
thereof:

            "Notwithstanding  the foregoing,  neither the execution and delivery
            of  the  Merger  Agreement  or  the  Stock  Option  Agreement,   nor
            consummation  of  the   transactions   contemplated  by  the  Merger
            Agreement or the Stock Option Agreement,  shall cause a Distribution
            Date."

            4.  Clause (i) of Section  7(a) of the  Rights  Agreement  is hereby
modified, amended and restated in its entirety as follows:

            "(i) the  earliest of (x) the close of business on November 6, 2006,
            (y) such other date as may be  established by the Board of Directors
            prior to the expiration of the Rights,  or (z) the time  immediately
            prior to the  consummation of the merger  contemplated by the Merger
            Agreement (such earliest date, the "Final Expiration Date"),

            5. Section 15 of the Rights Agreement is hereby modified and amended
to add the following sentence at the end thereof:

            "Nothing in this Agreement  shall be construed to give any holder of
            Rights or any other Person any legal or equitable rights,  remedy or
            claim  under this  Agreement  in  connection  with any  transactions
            contemplated by the Merger Agreement or the Stock Option Agreement."

                                    * * *

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            IN WITNESS  WHEREOF,  this  Amendment  has been duly executed by the
Company and the Rights Agent as of the day and year first written above.

                           PREMARK INTERNATIONAL, INC.



                           By:     /s/ Nancy Rosengrin
                                   -----------------------------
                           Name:   Nancy Rosengrin
                           Title:  Vice President



                          NORWEST BANK MINNESOTA, N.A.
                           (as Rights Agent)



                           By:     /s/ Lawrence W. Skatoff
                                   -----------------------------
                           Name:   Lawrence W. Skatoff
                           Title:  Senior Vice President and
                                   Chief Financial Officer




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