This type of coupling is a rigid rod whose connecting shafts are inclined to each other. Material] - The universal joint coupling nuts are made of premium material, which is sturdy and durable for long lasting use. [Feature] - universal joint coupling adopts a special coupler, used for connecting the motor shaft and the hexagon wheel of the robot, toy cars, and other models Widely used for shafts that transmit rotary movements. Industrial Universal Joints for sale | Shop with Afterpay | Australia RC Model Coupling 5mm To 6mm Bore Rigid Copper Shaft Coupler Robotics Bangladesh Steering Coupler For RC Models Thread Diameter on Side: M3., Package Content: 1 x Couplings Buy uxcell 3mm to 4mm inner dia rotatable universal steering shaft u joint coupler l23xd9 at , get more u-joints in various size This type of coupling is a rigid rod whose connecting shafts are inclined to each other., Specifications: Material: 45# Steel., Color: Silver. This universal joint coupling has a simple structure, light weight, small volume, and convenient assembly and disassembly.