The 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. Manufacturer: RAM Mounting Systems, Inc. Manufacturer Part Number: RAP-B-400-GOP1U. Brand Name: RAM Mounts. Product Name: Small Tough-Claw Mount with Custom GoPro Hero Adapter. Product Type: Clamp Mount. [Product Information] Device Supported: Camera. [Physical Characteristics] Weight (Approximate): 9.60 oz. [Miscellaneous] Additional Information: Clamping Range (Rail/Tube Surfaces): 0.625" to 1.5" Clamping Range (Flat Surfaces): 0" to 1.14" . Compatibility: GoPro Cameras: Hero 4 Black Hero 4 Session Hero 4 Silver Hero 3 Hero 2 Hero . Assembly Required: No. Country of Origin: United States. [Warranty] Limited Warranty: Lifetime.