The RAM-B-400-238U consists of the small RAM Tough-Claw base, marine-grade aluminum double socket arm and diamond base adapter. The RAM Tough-Claw is the perfect mounting base for quick and easy tool-less installation and removal on round, square, odd shaped rails and bars. The RAM Tough-Claw can be clamped on rails from 0.625" - 1.14" outer diameter. The diamond base adapter contains the industry standard universal 2-Hole AMPS hole pattern, which will connect to a large variety of RAM Mount and third party holders. 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; allowing for almost infinite adjustment and perfect viewing angles.