The RAM single swing and socket arm mount includes a 6" straight swing arm mounted on a vertical surface mounting base. At the end of the mount is a rectangular 6.25" x 2" top base. The pivoting point of the rectangle base allows 180 degree rotation, the swing arm allows a 360 degree rotation. RAM-109HSB Dimensions A. Center of knob to center of ball socket: 6" B. Overall length of swing arm assembly: 10.75" Material: Powder Coated Marine Grade Aluminium Colour: Black Ball Size: 1.5" Rubber Ball