Connect the steering gear and wheel steering knuckles, accurately transmit steering force to control the steering angle of the wheels, and adapt to the up and down bouncing trajectory of the wheels to ensure the accuracy of steering operation and the stability of vehicle driving. Made of high rigidity alloy material, coated with wear-resistant protective layer on the surface, the ball head rotates smoothly without resistance, the sealing rubber sleeve is dust-proof and waterproof, and there is no looseness or abnormal noise during long-term use. It has strong impact and fatigue resistance.