- Set of 12 brass clutch connectors for RC motor shafts, size 4 mm to 5 mm - Designed to join shafts of different diameters in airplane, boat, robot, and electric car models - High-quality brass material, oil-resistant and corrosion-resistant, ensures durability and performance - Sturdy structure and easy to install, no maintenance required - Top-Dight type rigid clutch provides high torque, rigidity, and low inertia - Ideal for transmitting rotational movements in metal, mold, and mechanical system applications - Package includes 12 connectors, 2 Allen keys, and 48 screws for complete assembly - Efficient and reliable solution for DIY and RC modeling projects