3M 76632, Roloc Disc 777F, 50 YF-weight, TR, 3 in, Die R300V, 7000045628 
Insize 4001-3E, CYLINDER GAGE BLOCK, 3″, 6928640358760
$190.63
Made of special alloy steel, hardness HRC64, high stability, wear resistance and easy combination.
Meet ASME B89.1.9, grade AS-1.
Can be connected with M6x1 screw and combined to any sizes up to 150″.
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