This system includes :Front Kncukle Arm-2PCSC-Hubs-2PCSRear Knuckle Arm-2PCSFront Lower Arm-2PCSRear Lower Arm-2PCSStainless metal Round Head Screw 3x20-6PCSStainless metal Flat Head Screw 3x6-4PCSStainless Steel washer 3m-4PCSStainless Steel Round Head Screw 3x16-4PCSOriginal Name / role No:AR330519+AR330523+AR330522+AR330520+AR3305211. Front c-hubs: Stabilize knuckle hands to rotate smoothly.2. Front knuckle hands: Assist steering.3. Back knuckle arms: Stabilize CVD drive shaft and bearing.4.Support the chassis and stabilize the front&rear knuckleMajor benefits of updating to the part/product :1. Made out of an excellent lightweight high tensile energy aluminum 6061 T6 for greater durability.2. Delrin collars are placed to attenuate the space and friction so the steering performance is premier.3. Knuckle arms: Delrin collars are inserted to minimize the gap and fortify the fitting for a smooth and stable drive.4. Exquisite 3D improve created by CNC machine to exhibit contemporary and metallic look.5. Numerous placement holes for users to modify the angle of dampers.