3M 83980, Roloc Disc Pad TR, Extra Hard 4 in 5/8 -11 Internal, 7000119300 
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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