This product includes :Front Kncukle Arm-2PCSC-Hubs-2PCSRear Knuckle Arm-2PCSStainless steel Round Head Screw 3x20-6PCSStainless metal Flat Head Screw 3x6-4PCSStainless metal washer 3m-4PCSOriginal name / role No:AR330519+AR330523+AR3305221. Front c-hubs: support knuckle arms to be able to turn effortlessly.2. Front knuckle arms: Assist steering.3. Rear knuckle arms: Stabilize CVD drive shaft and bearing.Major features of updating to this part/product :1. Made with a great light weight high tensile energy aluminum 6061 T6 for greater durability.2. Delrin collars are placed to reduce the gap and friction therefore the steering performance is best.3. Knuckle arms: Delrin collars are placed to attenuate the room and bolster the fitting for a smooth and stable drive.4. Exquisite 3D improve made by CNC unit showing contemporary and metallic look.