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 
Dynabrade 97568 3/8" NPT Female Safety Coupler 
Insize 4131-81, AMERICAN STANDARD THREAD PLUG GAGE, 8-32UNC, 6928640358920
$88.38
Class 2B.
Standard ANSI/ASME B1.2
Supplied with Go and No-Go gages together
Supplied with manufacturer inspection certificate.
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