3M 87209, Cubitron II Depressed Center Grinding Wheel, T27, 4-1/2 in x 1/4 in x 7/8 in, Single Pack, 7010299049, 10 per case 
Insize 2187-250, ADJUSTABLE SNAP GAGE, 9.37-9.84″, 6928640314674
$952.34
Used as Go/No-Go gage by setting upper and lower limits.
Flatness of anvil: 59_in.
Parallelism between tips and anvil: range 0-1.26″: 118_in,
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