Arkon's SPRM8SKT is a handy connector shaft that has a 25mm (1 inch) ball pattern on one end, and an octagon button socket on the other end. Part of Arkon's Robust Mount Series, SPRM8SKT facilitates swivel-ball rotation and is compatible with 25mm (1 inch)-compatible holders, cradles, and adapters to create your own custom mount solution. Or, connect Arkon's octagon button-compatible SPRMSRA Double Socket Swivel and Ratchet Arm, SPRMSWA Double Socket Swivel Arm, or SPRM8RTE Octagon Ratchet Elbow to the other end of the shaft. The possibilities are endless! Use with Arkon's 25mm Robust Mount Series as well as RAM Mounts Size B components. This highly versatile mount shaft arm measures 2.13 inches (54mm) tall, and along with your choice of mount head and base (sold separately), you can create a custom double-ball mount solution with ultimate flexibility on both ends of the mount.