The RAM double swing and socket arm mount includes a 6" straight swing arm mounted on a horizontal surface mounting base. At the end of the mount is a rectangular 6.25" x 2" top base. The bolt pivoting point of the mount allows a 360 degree rotation. RAM-109H-2 Dimensions A. Overall length: 15.41" B. Overall height: 6.76" C. Length from bottom of base to top of knob: 4.89" Ball Size: 1.5 Inch Rubber Ball Color: Black Powder Coat Material: Powder Coated Marine Grade Aluminium