3M 11411, Roloc Disc 361F, 50 YF-weight, TR, 1 in, Die R100N, 7000045095 
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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