3M 64797, Scotch-Brite EXL Unitized Mounted Point, A21 x 1/4 in 8S FIN, 3M 7010292685 
Insize 2187-139, ADJUSTABLE SNAP GAGE, 5.24-5.47″, 6928640314575
$340.53
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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