Dynabrade 57923 4" W x 4-1/2" L Dynabug "Model T" Orbital Sander, Non-Vacuum, 20,000 RPM, 3/32" Orbit, Hook-Face 
Insize 2187-19, ADJUSTABLE SNAP GAGE, .51-.75″, 6928640314384
$140.37
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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