3M 45093, Roloc Disc Pad TR, Extra Hard 3 in 1/4-20 Internal, 7000045285 
Insize 3290-063, V-ANVIL MICROMETER, .04-.6″, 6928640328015
$272.07
Graduation .0001″.
Measure the outside diameter of cutting tools (such as taps, reamers, end mills) with 3 or 5 flutes.
Ratchet stop.
Carbide measuring faces.
Supplied with setting standards
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