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Explanation: If shim means for you :
generally thin discs or other pieces of specified thickness.They are used singly or in combination for final adjustments,which may be necessary,e.g.in order to compensate wear.
Reference 1)Customs Tariff
(1) TERM wedge
Reference Customs Tariff;Notex CCD;84.48 2)BTM
(2) TERM shim
(3) TERM shim piece