Accessories:Rear Lower Arm-2PCSStainless Steel Round Head Screw 3x16-2PCSStainless Steel Round Head Screw 3x18-2PCSSet Screw 4x10-2PCSOriginal Name / Part No:AR330192Product major functions & usage:Support the chassis and stabilize the rear knuckleMajor advantages of upgrading to this part/product :1.Aluminum 6061 T6 is a light material with high tensile strength and great durability during extreme RC action. Delrin collars are designed and hand-installed to eliminate the gap and friction in order to reach the best performance, in harmony with the rest of the vehicle.2.Compare to the original design, this product has a fashionable hollow design.3. Multiple positioning holes for users to adjust the angle of the dampers.