Modelcraft shim washers packs of 20 modelcraft 98860 3 modelcraft shim washers 12 x 6 x 03mm pack of 20 are hardened and ground to size shim rings which are used instead of normal washers particularly in gear manufacturing as a spacer washer between gearwheels on axles and shafts modelcraft 98860 3 shim washer 12x6x03mm pk20