The RAM® Double Socket Arm with Round Plate consists of a 2.5-inch round base and short double socket arm that will accept 1-inch ball bases. The round base contains pre-drilled holes, including the universal AMPS hole pattern. Designed into the mount is a 1-inch diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob allows for you to maneuver the mount to your optimum viewing position.