• 2 arms dimension: Lower arm 4.5"; Upper arm 4"; Total Height 14.1"
• Strong 2 magnet surfaces with ON/OFF control provides 176lbs Max Pull (30mm and up thickness metal countertop/surface required for 176lbs pull)
• 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 Tools dial/digital indicators and other market indicators