The RAM-B-149Z-GA5U consists of a double socket arm, zinc coated u-bolt base, diamond adapter base and custom high strength composite cradle for the Garmin eTrex NON-COLOR GPS. 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 Garmin eTrex touch 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: Garmin eTrex Legend Garmin eTrex Summit Garmin eTrex Venture Garmin eTrex Vista Material: High Strength Composite & Powder Coated Marine Grade Aluminum Ball Size: 1″ Rubber Ball „B” Size Note: The „U” in the part number reflects product packaged in poly bag. This mount will not hold Garmin eTrex COLOR GPS devices.Related Links:RAM Apple Mounts Page.