3M 9450, Disc Pad Holder 917, 7 in x 5/16 in x 3/8 in 5/8-11 Internal, 7000028549 
3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
Insize 4209-1, LONG HANDLE TELESCOPING GAGE, 5/16 ~ 1/2″, 6928640311536
$14.30
For quick measurement of inside diameter of deep holes and width of slots.
Satin chrome finish.
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Insize 4209-2, LONG HANDLE TELESCOPING GAGE, 1/2 ~ 3/4″, 6928640311543
$14.30