RidePower Stem Mount For Ball Phone Mounts - 1 Ball Featuring articulating ball mounting technology and a 1 ball diameter, mounts device in your motorcycle's cockpit using open steering stem orifice - ranging from 1/2 to 11/16 in diameter. Compatibility: Socket mounts compatible with 15/16 ball diameter RidePower all-metal mounts RidePower inductive charging mounts with articulating mounting Mounts sold separately Not compatible with solid or permanently capped steering stems Features: Designed to fit 1/2 to 11/16 steering stem holes 1 ball (measures 15/16) Mounting bracket is designed for durability Comes with an Allen wrench for easy assembly