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″.

Insize 7231, SCRIBER, 6928640320071
3M 85492, Scotch Foil Tape 3311-10A, 2.0 in x 10 yd (50.8 mm x 9,1 m), 7010383663
Dynabrade 95745 1/4" NPT Speed Regulator
Dynabrade 98270 1/2" Male Coupler
3M 72003, Powerflow High Efficiency SP3 Particulate Filter System Component 450-01-01R20, 7000131701, 20 EA/Case 