The RAM-B-149Z-GA7U consists of a double socket arm, zinc coated u-bolt base, diamond adapter base and custom high strength composite cradle for the Garmin GPSMAP. 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 GPSMAP 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 GPSMAP 176 Garmin GPSMAP 176C Garmin GPSMAP 276C Garmin GPSMAP 376C Garmin GPSMAP 378 Garmin GPSMAP 478 Garmin GPSMAP 196 Garmin GPSMAP 296 Garmin GPSMAP 396 Garmin GPSMAP 496 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.