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