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 64802, Scotch-Brite EXL Unitized Mounted Point, B52 x 1/8 in 8S FIN, 3M 7100068025
Dynabrade 53533 Cone or Plug Grinder (Triple Extension)
3M 64799, Scotch-Brite EXL Unitized Mounted Point, B121 x 1/8 in 8A CRS, 3M 7010329841
Dynabrade 92210 1/8" W x 12" L 320 Grit A/O DynaCut Belt, 50/pack
3M 55656, Stikit Film Disc w/Tab 375L, P240, 5 in x NH, Die 500X, 7100106552, 250 per case
3M 25774, Scotch-Brite Roloc Surface Conditioning Disc, TSM, 1-1/2 in x NH A MED, 7100014112, 200 per case
Insize 4120-12N, METRIC THREAD RING GAGE, NO GO, M12x1.75, 6928640341786 