3M 33054, Scotch-Brite Bristle Disc, 36, 4-1/2 in x 5/8 in-11 Internal, 7100138181 
Insize 3282-2, DISK MICROMETER, 1-2″, 6928640328091
$155.31
Graduation .0001″.
Measures root tangent length of gear.
Ratchet stop.
Supplied with setting standards (except with 0-1″).
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