Metal Super Clamp with Double Ball Head for Mount CameraMetal Super Clamp with Double Ball Head Magic Arm 1 4'' 3 8'' Screw Hole for Mount Camera Monitor LED Light Mic Features: 1. Multi Functional Super Clamp with Ballhead is a multifunctional double ball head with a clamp at the bottom and a 1 4" screw on the top. 2. It can mount monitor and LED Lights or monitor or camera on the one end via 1 4 screw, and it can lock the rod on the cage via the clamp tightened by the locking knob. 3. 3 8" screw to mount