Ball & Mounting Hardware for the Raymarine Dragonfly Emounting.nl Mount set Hardware for the Raymarine Dragonfly Emounting.nl RAM Tough Claw with Round Base D Ball Sunshine Coast Marine RAM B 202 379 M616U RAM Mounts Drill Down Double Ball Mount for. The RAM B 400 379 M616U consists of the Tough Claw rail clamp base, STANDARD length double socket arm and 1" diameter ball, containing a M6 x 30 SS HEX head bolt. The Tough Claw rail clamp base is the perfect mounting base for quick and easy tool less installation and removal on round, square, odd shaped rails and bars. 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 400 379 M616U 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. CLAMP RANGE . 625" 1. 5" diameter 0" 1. 14" flat surfaces SOCKET TO SOCKET LENGTH 3"