Dynabrade 51629 .1 hp Straight-Line Pencil Grinder, Central Vacuum, 1/8" Collet 
Insize 2187-44, ADJUSTABLE SNAP GAGE, 1.50-1.73″, 6928640314421
$166.36
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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