Features: 1. Maintenance-free, oil proof and corrosion resistance 2. Ideal accessories for RC Model motor, such as airplane boat model 3. Rigid coupling,high torque with rigidity,low inertia and excellent sensitivity 4. No rotation gap, elastic action can make up for symmetrical angular misalignment 5. Suitable for model car, model boat, hardware, mould, mechanical drive situations etc Package Content:5 x Shaft Couplers and 10 x Screws