3M 45190, Disc Pad Hub, 4-1/2 in 5/8-11 Internal, 7000045659 
Insize 2425-E12, BORE GAGE FOR SMALL HOLES, .32″-.47″, 6928640357053
$1,739.45
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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