1Fitment: Bearing flange steering knuckle spring is installed on the left and right front wheels, and is applicable to Quad Bike Atv Go Kart with 6in tires. 2Heavy Duty Design: Forged with high hardness steel alloy and heat treated to provide better finish and ensure high bearing hardness, wear resistance and high strength. 3Wheel Accessories: The steering knuckle transmits and bears the load at the front of the car, supports and drives the front wheel to rotate around the kingpin, making the car turn stably. 4Ideal Replacement: Replace the short axle knuckle of the front wheel hub of the original vehicle to provide a smoother driving experience, and it will not break even under various bad road conditions. 5Detail Size: Flange center hole diameter is 17mm. Flange stud diameter 8mm. The distance between flange mounting holes is 78mm. Steering knuckle stud 16mm.