The RAM-B-121-GA63U consists of a yoke clamp base, double socket arm and Garmin VIRB™ camera adapter. The yoke clamp base will fit rails from 0.625" to a maximum of 1.25". The 1" rubber ball is positioned at a right angle to the plane of the mount when connected to a rail, the ball sits parallel to the rail. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm this allowing for almost infinite adjustment and perfect viewing angles. The adapter attaches directly to the underside of the camera, replacing the factory mounting bracket.