Dynabrade 77757 4-1/2" Dia. x 7/8" Center Hole, 40 Grit, Z/A, Type 27, DynaCut Flap Disc W/Fiberglass, 10/pack 
Insize 3229-13, TUBULAR INSIDE MICROMETER, 12-13″, 6928640328879
$214.02
Graduation .001″
Carbide measuring faces.
12 to 13″ Range
Accuracy: .00036″
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