Engineers 1 2 3 Blocks Ultra Precision 0.0002" Ground Hardened Milling Tools UK Material:Hardened Ground Steel 3" Long x 2" Wide x 1" High Accuracy：0.0002" Threaded 3/8-16 UNC Size(L*W*H)：Single piece L76.2*W50.8*H25.4mm Packaged included: 2 x Precision Blocks USED WHEN MOUNTING WORK FOR MILLING GRINDING ETC .
eBay