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.