The RAM-111U consists of a 63mm diameter round base that contains the universal hole pattern, STANDARD LENGTH double socket arm and 158mm x 52mm 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, VHF Radios, Fishfinders, Gimbal Brackets and more. Overall length 186mm and will hold up to 1.8kgs.