Dynabrade 98271 1/2" NPT Male Plug 
Insize 2187-51, ADJUSTABLE SNAP GAGE, 1.73-2.01″, 6928640314438
$182.37
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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