Consists of a 2.5″ diameter round base that contains the universal AMPs hole pattern, a double socket arm and 6.25″ x 2″ rectangle base. The rectangle base 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. Made of Powder Coated Marine Grade Aluminum.