3M 49937, Roloc Disc 361F, 60 YF-weight, TSM, 2 in, Die RS200PM, 7000119016 
Insize 3229-18, TUBULAR INSIDE MICROMETER, 17-18″, 6928640356889
$251.56
Graduation .001″
Carbide measuring faces.
17 to 18″ Range
Accuracy: .00040″
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