3M 65489, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc DUH5120TRI-10I, 5 inch UH, 120, 7100202873, 10 per pack 
Insize 3229-3, TUBULAR INSIDE MICROMETER, 2-3″, 6928640328770
$93.58
Graduation .001″
Carbide measuring faces.
2 to 3″ Range
Accuracy: .00020″
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