3M 28713 ROLOC DISC PAD TR, HARD 4 IN 5/8-11 INTERNAL, 7010298961 
Insize 3282-1, DISK MICROMETER, 0-1″, 6928640328084
$140.14
Graduation .0001″.
Measures root tangent length of gear.
Ratchet stop.
Supplied with setting standards (except with 0-1″).
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