Dynabrade 65123 Adapter Assembly-1/2 X 72 
Insize 3241-4, DEPTH MICROMETER, 0-4″, base 3.996_.669″, 6928640326738
$190.63
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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