Enhance your machinery with this high-quality universal coupling. Designed for precision and durability, this coupling is perfect for electric vehicles, model cars, model boats, and robots. Made from premium 45# steel iron, it serves as an RC boat car shaft coupler, metal cardan joint, motor connector, universal joint coupling, and gimbal, ensuring long-lasting performance and seamless integration into your projects. Ideal for professionals and hobbyists alike! Product Specifications Total Length: 23mm Inner Diameter: 5mm Outer Diameter: 11mm Weight: Approx. 10g Fixing Hole: M4 Material: 45# Steel Iron, built for durability Applications Suitable for electric vehicles, model cars, model boats, robots, and other mechanical projects requiring flexible and reliable shaft connections, including RC boat car shaft couplers, metal cardan joints, motor connectors, universal joint couplings, and gimbals.