This 1" ball mount is compatible with Compatible with RAM Mounts B Size Double Socket Arm Ball and Socket technology allows for near-infinite adjustability The ball mount consists of a B-size 1-inch TPU ball with a 25.4mm diameter ball head attached to an 1/4"-20 externally threaded steel post. Universal threaded hole solution for a variety of use cases The ball mount is made of stainless steel, which is durable and not easy to be damaged. The stainless steel ball head is wrapped with high-quality rubber The TPU anti-slip ball head is shock-absorbing and anti-shake and is not easy to loosen. It is suitable for any bracket base that supports B Size 1" Ball screw holes, expands the connection of other mobile phone bracket accessories, and can be freely rotated 360° to adjust any angle