3M 14215, Roloc Disc Pad TS and TSM, Medium 3 in 1/4-20 Internal, 7000119310 
3M 45190, Disc Pad Hub, 4-1/2 in 5/8-11 Internal, 7000045659 
Insize 3229-20, TUBULAR INSIDE MICROMETER, 19-20″, 6928640356902
$269.47
Graduation .001″
Carbide measuring faces.
19 to 20″ Range
Accuracy: .00043″
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