11" universal arm for holding test indicators. Arm is constructed of steel and has a central locking mechanism. The 8 mm indicator stem hole and dovetail grooves holds most dial indicators and test indicators. Indicator stem has a fine adjustment knob.

The arm has a 8 mm (0.315") x 40 mm (1.57") unthreaded stem for placing the arm in collets. Use a 5/16 collet for best fit.