Dynabrade 51811 .1 hp Straight-Line Pencil Grinder, Rear Exhaust, 1000,000 RPM, 1/16" Collet 
Insize 4162-2251, PIN GAGE SET. 250pcs, .251″ ~.500″, 6928640380259
$341.39
ACCURACY -.0002″
Class ZZ.
Made of alloy steel.
Hardness HRC60-62.
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