3M 20897, PSA Cloth Disc 348D, 80 X-weight, 4 in x NH, Die 400BB, 7010294664 
Insize 4179-4, CYLINDER GAGE BLOCKS FOR DEPTH MICROMETER, 4″, 6940561934908
$437.57
Made of special alloy steel, hardness HRC64, high stability, wear resistance and easy combination
Meet ASME B89.1.9-2002 Grade AS-1
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