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Two solid magnet surfaces with on/off control can provide a maximum tensile force of 176lbs (176lbs tensile force requires a metal working surface/surface with a thickness of 1.2"/30mm and above). Please tight en up the adjusting knob before using to get the powerful and stable magnet
Flexible, sturdy, precise rotary joint, can adjust any direction and position, high stability
Dimensions of 2 arms: lower arm 4.5"; upper arm 4"; total height 14.1 inches
Clamping hole diameter 8.5mm (0.33"), used for conventional digital/dial indicator
Clamping diameter: 5/16 inch ( 8mm). This magnetic base is compatible with digital dial indicator and metric dial indicator, NOT suit for Imperial dial indicator.