Clockwise Tools Indicator Magnetic Base 10pcs

10 pieces bundle sale 2 arms dimension: Lower arm 4.5"; Upper arm 4"; Total Height 14.1" Strong 2 magnet surfaces with ON/OFF control provides 176lbs (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