This iBOLT 25mm to ¼ 20 camera screw adapter is made out of heavy duty composite material and is compatible with all industry standard 1 inch / 25 mm mounting arms. Ball joints are coated in a rubber material. *This product is only the iBOLT 25mm to ¼ 20 camera screw adapter. Other images shown are to show the use of the product. Commonly used as an camera adapter with IBBZ-33921 or IBBZ-33791 and other industry standard 25mm / 1 inch dual ball mounts / arms. With the dual ball adjustments, this mount allows you to have the flexibility of rotating your device 360 degrees. The Ball size is 1 inch (25mm) and is to be used with other industry standard 1 inch (25mm) ball mounts