3M 87449 Silver Depressed Center Grinding Wheel, T27 Quick Change, 9 in x 1/4 in x 5/8-11 Center Hub Thread, 7010409732, 20 per case 
Insize 4162-2251, PIN GAGE SET. 250pcs, .251″ ~.500″, 6928640380259
$341.39
ACCURACY -.0002″
Class ZZ.
Made of alloy steel.
Hardness HRC60-62.
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