Material: pure brass Surface treatment: untreated Size description: For example: M5 * 10 * 1 (inner diameter * outer diameter * thickness) Use high-quality brass, with good rust resistance, corrosion resistance and other mechanical properties, strong and durable Brass flat gaskets are widely used in electronics, hardware, lighting, toys, bathrooms, furniture, medical care, sports equipment and other industries. They can be used to reduce friction and prevent loosening or dispersing pressure.