Connecting the steering gear and the steering knuckle, transmitting steering force to achieve wheel steering, and adapting to wheel runout to ensure precise steering and stable driving, is a key force transmission component of the steering system. High quality products are made of high hardness alloy material, with a uniform wear-resistant coating on the surface. The ball head rotates smoothly without jamming, and the sealing performance is good, dustproof and waterproof. Long term use has no looseness or abnormal noise, and is impact resistant and fatigue resistant.