For use with gages and gaging fixtures where an adjustable indicator mounting is required. A dovetail with rack and pinion adjustment provides 1-1/8" (28mm) indicator travel. A 1/8" hex wrench is used to adjust and lock the indicator in final position. The bracket has two counterbored mounting holes (for 1/4" socket head screws), and the back has four screw holes so the indicator back can be rotated. Back with Adjustable Mounting Bracket for No. 81 Series rotated.