3M 07394 Hookit Disc Pad, 178 mm x 25 mm M14-2.0 Internal, 7000045702 
Insize 3294-1, NON ROTATING SPINDLE DISK MICROMETER, 0-1″, 6928640328152
$264.28
Graduation .0001″.
Measure root tangent length of gear.
Non-rotating spindle.
Ratchet stop.
Supplied with setting standards
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