3M 45100, Roloc Disc Pad TR, Hard 1-1/2 in 1/4-20 Internal, 7000045286 
Insize 2435-E2903, BORE GAGES, measuring depth 30″, range 6.3-11.4″, 6928640391224
$6,477.27
Applicable for .001″ or .0001″ or .00005″ graduation dial indicators.
Carbide contact point and anvil.
Optional accessory: dial indicator or dial comparator, setting ring.
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