The product includes :Front Kncukle Arm-2PCSC-Hubs-2PCSRear Knuckle Arm-2PCSStainless metal Round Head Screw 3x20-6PCSStainless metal Flat Head Screw 3x6-4PCSStainless metal washer 3m-4PCSOriginal title / role No:AR330519+AR330523+AR3305221. Front c-hubs: Stabilize knuckle hands to be able to turn efficiently.2. Front knuckle hands: Assist steering.3. Rear knuckle arms: Stabilize CVD drive shaft and bearing.Major advantages of updating to this part/product :1. Made with a good light weight high tensile power aluminum 6061 T6 for greater durability.2. Delrin collars are inserted to reduce the gap and friction so the steering performance is best.3. Knuckle arms: Delrin collars are inserted to attenuate the space and strengthen the fitting for a smooth and stable drive.4. Exquisite 3D streamline produced by CNC device to show modern and metallic look.