Outstanding MaterialOur metal washers are made of high quality copper, which has good electrical conductivity, thermal conductivity, 1083 melting point and durable for daily use and can be used repeatedly.< /p> Easy to useO-rings are very easy to install, copper flat washer surface is smooth, reduce friction between fasteners, prevent leaks, insulate, prevent loosening or leaking pressure. Easy to storeThese copper flat washers are designed with a storage box, which makes the sealing ring gaskets safer and more convenient to store, easy to carry and store. maintain a good classification. This design will improve work efficiency. Wide ApplicationO-rings are perfect for water, sump plugs, fuel and plumbing fittings. The water seal kit is perfect for electrical connections on household appliances, appliances, automotive and marine. Ring washers are really cool tools. What you will get Flat washers include 30pcs M5*9*1, 30pcs M6*10*1, 20pcs M6*12*1, 20pcs M8*12*1, 20pcs M8*14*1, 20pcs M10*14*1, 20pcs M12*16*1, 20pcs M12*18*1.5, 20pcs M14*18*1, which is enough for daily use. Product Advantages: The copper washers are made of high quality copper, sturdy and durable for long time use. Due to the exceptional copper material, the melting point of copper washers up to 1083. Copper flat washer plates have a good electrical and thermal conductivity. All gasket injectors contained in a compartmentalized clear plastic case, easy to use and transport. Our cap washer kit sump plugs are ideal for sump plugs, water, fuel and plumbing fittings. Assorted copper washers are suitable for all types of engines, such as car, marine, generator, machines. Specifications Product Name: Metal Washers Material: Copper Quantity: 200 pieces Color & Size: As Pictures Show Package Include: 1 x Storage Box 30 x M5*9*1 30xM6*10*1 20xM6*12*1 20xM8*12*1 20xM8* 14*1 20xM10*14*1 20xM12*16*1 20xM12*18*1.5 20 x M14*18*1 Friendly reminder Our O-rings are small parts, please do not let children play to avoid accidental swallowing.< /p> Due to the light and screen difference, the color of copper washers may be a little different from the pictures.