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″.

3M 12952, Scotch-Brite Roloc Surface Conditioning Disc, SC-DR, A/O Very Fine, TR, 4 in, 7100007032, 100 per case
3M 21713, Scotch-Brite Roloc Pro Brake Hub Cleaning Disc, XO-DR, 07546, SiC Extra Coarse, 1-1/2 in x 5/8 in, 7100176087 
