3M 22409, Roloc Disc 361F, P120 XF-weight, TR, 1-1/2 in, Die R150S, 7000045103 
3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
Insize 2187-76, ADJUSTABLE SNAP GAGE, 2.76-2.99″, 6928640314476
$205.36
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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