Ram Mount 1-Inch Diameter Ball Standard Length Double Socket Arm with 2.5-Inch Round Base (Black) Consists of a 2.5" round base and double socket arm that will accept 1" ball bases The round base contains pre-drilled holes, including the universal AMPS hole pattern Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both ends Allows for you to maneuver the mount to your optimum viewing position Overall Length: 4.31"