Dynabrade 78483 3" Dia. x 1", 1/4-20 Female Center Thread, A/O, 120 Grit, 10-Ply J-DynaCut Cross Pad, 100/pack 
Insize 3240-4, DEPTH MICROMETER, 0-4″, 6928640355394
$138.64
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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