Dynabrade 52474 Vane Set (4pk) 
Insize 2435-E84, BORE GAGES, measuring depth 40″, range .24-.32″, 6940561947625
$5,454.55
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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