3M 78469, Cubitron II Depressed Center Grinding Wheel, T27, 4 in x 1/4 in x 3/8 in, 7100086893, 20 per case 
Insize 3229-10, TUBULAR INSIDE MICROMETER, 9-10″, 6928640328848
$176.56
Graduation .001″
Carbide measuring faces.
9 to 10″ Range
Accuracy: .00032″
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