3M 28476, Disc pad Hub, 2-1/2 in 5/8-11 Internal Low Profile, 7000045288 
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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