Dynabrade 55523 .3 hp Straight-Line, 6" Extended Die Grinder, Aluminum Housing 25,000 RPM, Rear Exhaust, 1/4" Collet 
Insize 4209-1, LONG HANDLE TELESCOPING GAGE, 5/16 ~ 1/2″, 6928640311536
$14.30
For quick measurement of inside diameter of deep holes and width of slots.
Satin chrome finish.
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