Check the listing for details. iBOLT 25mm / 1 inch/B Size to 4 Prong Composite Ball Adapter. Condition: New. Listed at 6.95 USD. This iBOLT 25mm to 17mm 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 a replacement for IBBZ-33921 or IBBZ-33791 and other industry standard 25mm / 1 inch dual ball mounts / arms to any industry standard 4 Prong bracket including iBOLT Tabdock Holders. 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. Converts a 1-inch/B Size/25mm Mount to a 4 prong mounting pattern for iBOLT Tablet/ Tabdock Holders.Length of this adapter is 1.5 inches measuring from one end of the arm to the other and is made out of sturdy composite material.*Mounts, holders, and devices sold separately