3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
Insize 2381-31, DIAL TEST INDICATOR, .03″, 6928640329692
$95.31
Graduation .001″
Jeweled bearing.
Carbide contact point.
Two measuring directions.
Anti magnetic body.
Supplied with two clamps: 5/32″ DIA and 3/8″ DIA.
Optional accessory: styli.
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