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″.

Dynabrade 78423 4-1/2" Dia. x 3/8" Very Fine DynaBrite Surface Conditioning Disc, 25/pack
3M 76625, Roloc Disc 777F, 80 YF-weight, TR, 1 in, Die R100N, 7000045621
Insize 0020-A199, VIBRATION PEN (THREE PARAMETERS), 6974029777059
Dynabrade 93351 Carbide Burr 12-Piece Burr Kit, 1/8" Shank
3M 64804, Scotch-Brite EXL Unitized Mounted Point, W163 x 1/8 in 8S FIN, 3M 7010300871 