2 arms dimension: Lower arm 2.38"; Upper arm 2.25"; Total Height 6.5"
Strong 2 magnet surfaces with ON/OFF control provides 88lbs (requires 30mm and up thickness metal/steel); The magnet works much better on thicker metal piece, thin metal/steel results less magnetic force
Clamping Hole Diameter Approx. 9.5mm, for regular digital/dial indicator use
Twist one black knob can adjust 3 rotary joints at any direction and location
Compatible with all Clockwise Tools dial/digital indicators and other market indicators