Dynabrade 52630 4" (102 mm) Dia. Right Angle Depressed Center Wheel Grinder, 1.3 HP, 13,500 RPM, 3/8"-24 Spindle 
Insize 3294-3, NON ROTATING SPINDLE DISK MICROMETER, 2-3″, 6928640328176
$304.13
Graduation .0001″.
Measure root tangent length of gear.
Non-rotating spindle.
Ratchet stop.
Supplied with setting standards
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