Accessories and Parts -RC Motor Accessory Coupling Coupler Coupler Adapter Connector 4mm to 8mm Highlights Generic RC Motor Accessory Coupling Coupler Coupler Adapter Connector 4mm to 8mm Made from high quality metal material, the coupler is stable , reliable and strictly functional. Coupling accessories can be used to connect motor shafts to drive shafts or two shafts of different sizes. Used to connect motor shaft and hex wheel of robot, toy cars and other models Suitable for RC model cars, ship boat and helicopter plane, etc. Material: Aluminum Alloy Size Chart: Approx. 14x14x25mm / 0.55x0.55x0.98inch Package includes: 5pcs Motor Shaft Coupling Coupling Connector with M4 Screw and Wrench Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item Due to manual measurement, there may be 1-2mm error in the size