3M 87446, Silver Depressed Center Grinding Wheel, T27 Quick Change, 5 x 1/4 x 5/8-11 in, 7010412149, 20 per case 
Insize 3240-4, DEPTH MICROMETER, 0-4″, 6928640355394
$140.63
Graduation: .001″.
Micrometer head accuracy: ?.00012″.
Rod accuracy: ?[.001+.0005(L/3)]”, L is the measuring range in inch.
Rods with flat end.
Ratchet stop.
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