Connect the steering system with the wheel steering knuckles, accurately transmit steering torque to drive wheel steering, compatible with wheel jumping up and down, maintaining steering responsiveness and driving stability. Made of high-strength alloy, with surface wear-resistant treatment in place, the ball head rotates flexibly without obstruction, the sealing structure is reliable and prevents impurities from entering, and there is no looseness or abnormal noise after long-term use. It is resistant to impact and wear.