The RAM-B-149Z-SPO2 consists of a double socket arm, zinc-coated u-bolt base, diamond adapter base, and a custom high-strength cradle for the SPOT Satellite GPS Messenger. Designed into the mount is a 1-inch 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 SPOT Satellite GPS Messenger mount to your optimum viewing position. Included in this package is hardware that will accommodate rails from 0.5 inches to 1.25 inches in diameter.