Ideal for stabilizing trolling motors, the RAP-400-D-202U consists of the small RAM Tough-Claw base, C size long double socket arm, and round 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 round base adapter contains the industry standard universal AMPS hole pattern. This mount is designed with RAM C size 1.5″ diameter patented 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.