Dynabrade 78540 3/4"Dia. 2-Set, 3-48 Female Center Thread, 180 Grit, Dynacut A/O Overlap Slotted Disc, 100/pack 
Insize 4789-2E, CONCENTRICITY GAGE, 6928640374456
$2,040.50
Applicable diameter .039″ DIA~.984″ DIA
Accuracy .00008″
Optional accessory: dial test indicator, mini magnetic stand (part no. 6224-40E).
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