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Specification:8 pcs screws designThread Size: M4Color: Silver ToneMaterial: SteelConnection Diameter: 8mm to 10mmTotal Length: 22mm /0.87 inchOutside Diameter : 16mm/ 0.63 inchThrough Angle: 90 Degree Package List:2 Pcs x Rigid Shaft Coupler8 Pcs x M4 ScrewsDescription:Made from Steel 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