DigitalFoto Ball Head Magic Arm GripThe High Weight Load Ball Head Magic Arm Grip from DigitalFoto Solution Limited features 2x swiveling balls with 1 4" 20 on each ends. The ball heads provide flexibility with its 360 horizontal and 270 vertical rotation. It is lightweight at 3. 8 oz and can hold a payload of up to 22 lb. Both sides rotate 360 horizontally and 270 vertically Tightening screws make attaching a monitor or microphone easier Tightening knob has two 3 8" 16 screw holes