Specification:4 pcs screws designThread Size: M4Color: RedMaterial: Aluminum AlloyConnection Diameter: 2mm to 4mmTotal Length: 20mm /0.78 inchOutside Diameter : 12mm/ 0.47 inchThrough Angle: 180 Degree Package List:1 Pcs x Rigid Shaft Coupler4 Pcs x M4 Screws Description:Made from aluminum alloy material to reduce inertiaRigid coupling,high torque with rigidity,low inertia and excellent sensitivityNo rotation gap, elastic action can make up for symmetrical angular misalignmentMaintenance-free, oil proof and corrosion resistanceSuitable for model car, model boat, hardware, , mechanical drive situations etc Note:Please allow 1-3mm differs due to manual measurementDue to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding
