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.