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 GCMagellan eXplorist 110Magellan eXplorist 310Magellan eXplorist 350H