3M 77737, ROLOC DISC PAD TS AND TSM, EXTRA HARD, 3 IN 1/4-20 INTERNAL, 7010299209 
3M 28713 ROLOC DISC PAD TR, HARD 4 IN 5/8-11 INTERNAL, 7010298961 
3M 45099, Roloc Disc Pad TR, Medium 1-1/2 in 1/4-20 Internal, 7000045280 
Insize 3240-6, DEPTH MICROMETER, 0-6″, 6928640326714
$159.43
Graduation: .001″.
Micrometer head accuracy: ?.00012″.
Rod accuracy: ?[.001+.0005(L/3)]”, L is the measuring range in inch.
Rods with flat end.
Ratchet stop.
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