The High Weight Load Ball Head Magic Arm Grip from DigitalFoto Solution Limited features a tightening knob with a 3/8"-16 screw hole on each side that can be converted to 1/4"-20 with the screw hole adapters. The ball head provides 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.