Dynabrade 78492 4" Dia. x 1", 1/4-20 Female Center Thread, A/O, 180 Grit, 8-Ply J-DynaCut Cross Pad, 100/pack 
Insize 3294-4, NON ROTATING SPINDLE DISK MICROMETER, 3-4″, 6928640375514
$376.56
Graduation .0001″.
Measure root tangent length of gear.
Non-rotating spindle.
Ratchet stop.
Supplied with setting standards
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