3M 26120, PPS Series 2.0 Adapter, Type S28, 17.5 mm Female, 19 TPI
Thread, 7100135956 
Insize 2435-E201, BORE GAGES, measuring depth 10″, range .47-.79″, 6928640390999
$2,654.22
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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