This 1" ball head adapter is compatible with Compatible with RAM Mounts B Size Double Socket ArmExtended Connection to Any RAM Phone Mount That Supports 1" Ball Heads.The ball mount consists of a B-size 1-inch TPU ball with a 25.4mm diameter ball head attached to an M8 x 1.25 externally threaded steel post. The threaded holes must contain the following dimensions to install this mount: M8 x 1.25pitch.The 1-inch ball head adapter 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, which plays a very good role in protecting the ball head. nd can Maintain durability and reliability in the most demanding environments.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 M8 screw holes, expands the connection of other mobile phone bracket accessories, and can be freely rotated 360° to adjust any angle