3M 94974, SandBlaster Large Sanding Tool, 463-000-4G, 3.7 in x 7 in, 7100140800 
Insize 2187-152, ADJUSTABLE SNAP GAGE, 5.75-5.98″, 6928640314599
$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