3M 45094, Roloc Disc Pad TR, Soft 2 in 1/4-20 Internal, 7000045278 
Insize 4789-1E, CONCENTRICITY GAGE, 6928640358296
$1,824.45
Applicable diameter .138″ DIA~.984″ DIA
Accuracy .00008″.
Optional accessory: dial test indicator, mini magnetic stand (part no. 6224-40E).
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