Dynabrade 77759 4-1/2" Dia. x 7/8" Center Hole, 80 Grit, Z/A, Type 27, DynaCut Flap Disc W/Fiberglass, 10/pack 
Insize 3294-4, NON ROTATING SPINDLE DISK MICROMETER, 3-4″, 6928640375514
$368.25
Graduation .0001″.
Measure root tangent length of gear.
Non-rotating spindle.
Ratchet stop.
Supplied with setting standards
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