3M 87447, Silver Depressed Center Grinding Wheel, T27 Quick Change, 6 x 1/4 x 5/8-11 in, 7010410646, 20 per case 
Insize 6884-E12, CALIPER/HEIGHT GAGE CHECKER, 0-12″, 6928640358876
$2,753.18
To check calipers and height gages.
Constructed with steel gage blocks.
Size: 0-12″
Accuracy: +/- 200?in.
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Insize 6140, DEPTH BASE ATTACHMENT, suitable for calipers with beam width (w) .630″, 6928640303579
$24.78