For zero setting of inside micrometers, three points internal micrometers and bore gages.
Deviation is the difference between the ordered size and the size marked on the setting ring when supplied.
For example, the ordered size is .2”, the size marked on the setting ring when supplied may be .20008″.
setting ring when supplied may be .20008″.

3M 27258, Ultra Durable 5 inch Power Sanding Discs, Universal Hole, 150 grit, 7100188466, 5 per pack
3M 87052, Cubitron II Stikit Film Disc 775L, 180+, 6 in x NH, Linered w/Tab, Die 600Z, 7100075206, 250 per case
Dynabrade 98263 3/8" NPT Male Plug
3M 26116, PPS Series 2.0 Adapter, Type S25, 1/4 Female, 19 Thread BSP, 7100135957
Dynabrade 11320 Contact Arm Ass'y, 5/8" Dia. x 3/8" W, Rubber Wheel, Offset to Prevent Gouging
3M 22409, Roloc Disc 361F, P120 XF-weight, TR, 1-1/2 in, Die R150S, 7000045103 