Product description Material: copper Quantity: 200 pieces Color: Golden Package includes: 1 x storage box 30 x M5 * 9 * 1 30 x M6 * 10 * 1 20 x M6 * 12 * 1 20 x M8 * 12 * 1 20 x M8 * 14 * 1 20 x M10 * 14 * 1 20 x M12 * 16 * 1 20 x M12 * 18 * 1.5 20 x M14 * 18 * 1 1. Excellent material Our washers are made of high quality copper material, which has good electrical conductivity, thermal conductivity, melting point of 1083 and is durable for daily use and can be used repeatedly. 2. Easy to use The sealing ring sets are very easy to install, the surface of the flat copper washer is smooth, and it can reduce the friction between the fasteners, prevent leakage, isolate, prevent loosening or dispersion pressure. 3. Easy storage These sealing rings are equipped with storage box, which makes sump plug washers more safe and convenient to store, easy to carry and easy to classify. This design improves work efficiency. 4. Wide range of applications The range of o-rings is ideal for water, sump plugs, fuel and hydraulic fittings. The copper rings are perfect for electrical connections to household and commercial appliances as well as automotive and marine applications. 5. What you get The copper sealing rings assortment contains 30 pieces M5 * 9 * 1, 30 pieces M6 * 10 * 1, 20 pieces M6 * 12 * 1, 20 pieces M8 * 12 * 1, 20 pieces M8 * 14 * 1 , 20 pieces M10 * 14 * 1, 20 pieces M12 * 16 * 1, 20 pieces M12 * 18 * 1.5, 20 pieces M14 * 18 * 1, perfect for electrical connections in household, commercial appliances, automobiles and ships.