【20mm Bll Head Mount】This 20mm ball mount is compatible with Bullet point Mounting Solutions, for Tackform 20mm double socket arms
【1/4"-20 Screw】This 20mm ball mount is compatible with Insta 360 X4, X3, X2, X, for DJI Pocket 3 2...action cameras and dash cameras equipped with 1/4 interface
【Solid and Sturdy】Made of metal aluminum alloy, last long for use
【Wide Usely】Due to its 360 degree free rotation advantage, you can use it to built a phone rig for photography or use it with a action camera/dash camera in car