Accessories:Gearbox-2PCSStainless Steel Cap Head Screw 1.4*6-4PCSStainless Steel Cap Head Screw 1.4*5-3PCSOriginal Name / Part No:AXI316068Product major functions & usage:Stabilize the transmission gears in order to acheive a smooth steering performance.Major advantages of upgrading to this part/product :1. Made with a quality light weight high tensile strength aluminum 6061 T6 for a great durability and high accuracy to acheive a smooth steering performance.2. Aluminum 6061 T6 material lets the gears cool down faster.