2 inch Wide Clamp Mount with 1.5 inch Ball Socket Arm & 75mm VESA Base The RAM-2461-247-2 consists of a 2 inch clamp base, double socket arm and 3.625 inch square base that contains a 75mm X 75mm VESA hole pattern. Designed into the mount is a 1.5 inch diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm. Ball Size: 1.5 inch Rubber Ball Size Material: Powder Coated Marine Grade Aluminium