3M 55992, Green Corps Depressed Center Grinding Wheel, T27 4-1/2 in x 1/4 in x 7/8 in, 36, 7000118599, 10 per case 
Insize 4810-601, CENTER GAGE, 60?, 6928640319297
$7.35
Graduation 0.5mm and 1mm
To check and set screw cutting tools,and check the angle and pitch of screw thread.
Angle accuracy: ?30min.
Made of stainless steel
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