The RAP-B-400-A-MA15U consists of the small Tough-Claw base, short double socket arm and 1″ diameter ball with a custom form-fit cradle for the Magellan eXplorist GC/110/310/350H series. 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 Tough-Claw can be clamped on rails from 0.625″ - 1.5″ outer diameter. Clamping Range (Rail/Tube Surfaces): 0.625″ to 1.5″ Clamping Range (Flat Surfaces): 0″ to 1.14″ Compatible Devices: Magellan eXplorist GC Magellan eXplorist 110 Magellan eXplorist 310 Magellan eXplorist 350H