[ Product Contents ] - 4pcs x 304 stainless steel solid round rod lathe bar stock. [ Size ] - Diameter: 5mm/ 13/64 inch; Length: 450mm/17.7 inch. [ Material ] - High hardness 304 stainless steel, strong rust-resistant , and corrosion-resistant, sturdy and durable. [ Feature ] - The surface is smooth, easy to shape, no cracks formed, keep car normal operation efficiently, and the steady car body to overcome difficulty easily. [ Application ] - Widely used in Gear shaft, motor shaft, short support shaft, shaft pocket model, miniature axle, model plane, model ship, model cars.