3M 02140, Fibre Disc Backup Pad, TN Quick Change , 4-1/2 in x 5/8-11 Internal, 7000045746 
Insize 3229-19, TUBULAR INSIDE MICROMETER, 18-19″, 6928640356896
$256.48
Graduation .001″
Carbide measuring faces.
18 to 19″ Range
Accuracy: .00043″
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