Material: Copper washers made of high-quality copper. Copper flat washers are durable, rust-proof, and have good electrical and thermal conductivity. Their melting point reaches 1083 °C. Size Types: Washers in different sizes: M5, M6, M8, M10, M12, M14, M16, M18, M20, M22. 15 types of flat washers can meet your different needs. Practical: The copper drain gaskets can distribute the load and prevent damage to the surface to be fastened, and insulate the steel screws from the surface; If the hole diameter is larger than the diameter of the fastening nut, a flat washer can be used. Widely used: Sealing ring, can be used for engine case oil, vehicle brake line, fuel oil, oil line, hydraulic accessories, also used for preload indicator, lock and vibration reduction Joint set: Contains the most commonly used copper gaskets in 15 sizes (M5-M22), 150 pieces of flat ring copper washers, packed in a compact, transparent and divided plastic case so that you can easily find the series and... 39;