Set of copper washers: The set contains 150 seals. Copper in 15 sizes: M5 x 9 x 1, M6 x 10 x 1, M6 x 12 x 1, M8 x 12 x 1, M10 x 14 x 1, M10 x 16 x 1, M10 x 18 x 1, M12 x 18 x 1, M12x18 *1.5mm. M14x18x1, M14x20x1.5, M16x22x1.5, M18x24x1.5, M20x26x1.5, M22x28x1.5. Multiple sizes and quantities can always meet your requirements. Your daily needs. High quality: our copper sealing rings are made of high-quality copper, are durable and wear-resistant. Corrosion, good conductivity, with a melting point of 1083 and suitable for daily use (reusable). Easy to use. Use: Seals copper is very easy to clean. When installed, the surface of the copper washers is smooth and can reduce friction between fasteners, prevent leakage, insulate, prevent loosening or pressure distribution. Easy to use range: The transparent storage box stores the assortment of copper rings of each size. in separate compartments so that you can easily identify and use them. Widely used. : O-shaped seal sets are suitable for