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Specification: 4 pcs screws design Thread Size: M4 Color: Blue Material: Aluminum Alloy Connection Diameter: 6mm to 6mm Total Length: 25mm /0.98 inch Outside Diameter : 14mm/ 0.55 inch Through Angle: 180 Degree Package List: 1 Pcs x Rigid Shaft Coupler 4 Pcs x M4 Screws Description: Made from aluminum alloy material to reduce inertia Rigid coupling,high torque with rigidity,low inertia and excellent sensitivity No rotation gap, elastic action can make up for symmetrical angular misalignment Maintenance-free, oil proof and corrosion resistance Suitable for model car, model boat, hardware, mould, mechanical drive situations etc Note: Please allow 1-3mm differs due to manual measurement Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding