The RAM-137, powder coated marine grade aluminium mount, consists of a double socket arm mount, one 2.5" diameter round base with 1.5" 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 more. Rubber ball andsocket technology dampens shock and vibration, as well as allowing for almost infinite adjustment and perfect viewing angles. For most applications, mount will support up to 5kgs. Material: Powder Coated Marine Grade Aluminium Ball Size: 1.5 Inch Rubber Ball Components RAM-202 RAM-201 RAM-137B