The RAM-B-149Z-DEL1U consists of a double socket arm, zinc coated u-bolt base, diamond adapter base and custom high strength composite cradle for the Delorme Earthmate. 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 Delorme Earthmate motorcycle mount to your optimum viewing position. Included in this package is hardware that will accommodate rails from 0.50" to 1.25" in diameter.