3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
3M 77158 Scotch-Brite Durable Flex Belt, 77158, 1/2 in x 18 in, A CRS, Trial Pack, 7010329334 
Insize 2187-146, ADJUSTABLE SNAP GAGE, 5.47-5.75″, 6928640314582
$399.45
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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Insize 6140, DEPTH BASE ATTACHMENT, suitable for calipers with beam width (w) .630″, 6928640303579
$24.78