The diameter of the ball join is 1 inch or 25mm. The measurement is not to describe the length of the entire adapter. Measure the diameter of the ball from top of one end to another. This iBOLT 25mm to 25mm Dual Ball Mount arm is made out of a sturdy composite material and is compatible with all industry standard 1 inch / 25 mm mounting arms. Ball joints are coated in a rubber material.

Commonly used as an extension arm with IBBZ-33921 or IBBZ-33791 and other industry standard 25mm / 1 inch dual ball mounts / arms. Use with Bizmount series mounts or any other 1-inch / 25mm / B size industry standard compatible mount.

With the dual ball adjustments, this mount allows you to have the flexibility of rotating your device 360 degrees.

Length of this arm / adapter is 2.5 inches measuring from one end of the arm to the other and is made out of sturdy composite material.