The RAM-D-111, mount, consists of a double socket arm mount, one 2.5" diameter round base with 2.25" rubber ball and flat 11" x 3" rectangular plate. The plate contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and much more. Rubber ball and socket technology dampens shock and vibration, as well as allowing for almost infinite adjustment and perfect viewing angles. Ball Size: 2.25" Rubber "D" Ball Size Material: Powder Coated Marine Grade Aluminium Colour: Black Components RAM-D-202 RAM-D-201 RAM-D-111B