uxcell 5 Pcs 4mmx100mm Metal Solid Round Rod Bar for DIY RC Model Car Widely used in Gear shaft, motor shaft, short support shaft, shaft pocket model, miniature axle, model plane. It aslo widely used in hardware, molds, and the occasion of the mechanical transmission. Polished finish offers a smooth surface with few imperfections. Keep car normal operation efficiently, and steady car body to overcome difficulty easily. Good helper for your Rc model Car to install in a balance of weldability, formability, and corrosion resistance.