Small Tough-Claw™; Mount w/Custom GoPro® Hero AdapterThe RAP-B-400-GOP1U consists of the small Tough-Claw™; base, double socket arm and 1" diameter ball with custom GoPro® Hero 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 Tough-Claw™; can be clamped on rails from 0.625" - 1.5" outer diameter. The GoPro® Hero adapter attaches directly to the under-side of the camera, replacing the factory mounting bracket. Clamping Range (Rail/Tube Surfaces):0.625" to 1.5"Clamping Range (Flat Surfaces):0" to 1.14"Specifications/Features: Material: High Strength Composite Ball Size: 1" Rubber Ball “B” Size Note: The “U” in the part number reflects product packaged in poly bag. Weight:0.6 lbs.