30-463-4 Groovemaster SetFor quick and accurate measurements of internal and external diameters of retaining ring grooves, o ring grooves, and undercuts. Precision machined from steel, hard chrome plated for extra wear resistance. Fits all 6" vernier, dial and digital calipers with a maximum jaw thickness of 0. 140". Measures internal grooves from 0. 200" up to the capacity of the caliper. Complete Set includes the following Groovemaster Size 1 Groovemaster Size 2
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