Features: This double hole clamp features a sturdy 17mm ball head and a 1/4inch female screw hole, enabling versatile attachment to various phone holders, camera mounts, and tripod accessories for seamless device integration. Made from plastic, it securely grips round tubes with diameters from 13mm to 48mm and objects up to 37mm thick, perfect for mounting on bikes or gym equipment as a phone holder or camera mount. Ideal for photographers, live streamers, and motorcycle enthusiasts who need a stable, adaptable mount for their smartphones, tablets, or action cameras during dynamic activities. Suitable for scenarios like professional photography, live broadcasting setups, or attaching to bicycles, desks, and microphone stands as a bike mount or tripod adapter for stable positioning. Its compatibility with a wide ranges of accessories, including action cameras, smartphone clamps, and tablet holders, makes it an essential tool for enhancing mobile setups in diverse environments. Specifications: Component: Plastic Size: 72x43x35mm Suitable for 13mm-48mm/0.51''-1.89'' diameter round pipes, 37mm/1.46'' thick wood board Package Includes: 1Piece Double 1/4 Female Screw Hole Base Clamp, 1Piece 1/4 External Thread To 17mm Ball Head note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.