The RAM-B-149Z-TO4U consists of a double socket arm, zinc coated u-bolt base, diamond adapter base and custom high strength composite cradle for the TomTom One. Designed into the mount is a 1″ diameter patented rubber ball and socket system with adjustment points at the base and cradle. With a twist of the arm knob, you can move the motorcycle TomTom One mount to your optimum viewing position. Included in this package is hardware that will accommodate rails from 0.50″ to 1.25″ in diameter. This mount is designed to hold the following devices: TomTom One (2nd Edition) TomTom One (3rd Edition) TomTom One V2 TomTom One V3 Material: High Strength Composite and Powder Coated Marine Grade AluminumBall Size: 1″ Rubber Ball „B” Size Note: The „U” in the part number reflects product packaged in poly bag. Related Links:RAM GPS Mounts Page.