The item includes :Front Kncukle Arm-2PCSC-Hubs-2PCSRear Knuckle Arm-2PCSStainless steel Round Head Screw 3x20-6PCSStainless steel Flat Head Screw 3x6-4PCSStainless steel washer 3m-4PCSOriginal title / role No:AR330519+AR330523+AR3305221. Front c-hubs: help knuckle arms to turn effectively.2. Front knuckle hands: Assist steering.3. Straight back knuckle hands: Stabilize CVD drive shaft and bearing.Major options that come with upgrading on part/product :1. Constructed with an excellent lightweight high tensile energy aluminum 6061 T6 for greater durability.2. Delrin collars are placed to reduce the area and friction and so the steering performance is best.3. Knuckle hands: Delrin collars sit to attenuate the space and bolster the fitting for a smooth and stable drive.4. Exquisite 3D improve created by CNC product showing contemporary and metallic look.