3M 76631, Roloc Disc 777F, TR, 3 in x NH, 36 YF-weight, 7000028339 
Insize 2187-32, ADJUSTABLE SNAP GAGE, .98-1.26″, 6928640314407
$161.16
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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