3M 20931, PSA Cloth Disc 348D, P100 X-weight, 1 in x NH, Die 100N, 7000118915 
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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