The RAM-B-202-379-M616U consists of a 2.5" diameter round base with the universal AMPS hole pattern, STANDARD size double socket arm and 1" diameter ball, containing a M6 x 30 SS HEX head bolt. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm this allowing for almost infinite adjustment and perfect viewing angles. The RAM-B-202-379-M616 reduces the mounting footprint, compared to old dragonfly units that contain a large neck. This mount allows for a seamless marriage of RAM components into your Raymarine system, opening up the ball and socket system and all of our mounting options to you.