【Exquisite Material】Our metal washers are made of high-quality copper, which has good electrical conductivity, thermal conductivity, melting point 1083 ℃, and is durable for daily use and can be used repeatedly. 【Easy to Use】The O-rings are very easy to install, the surface of the copper washer is smooth, reducing friction between fasteners, preventing leakage, insulating, preventing loosening or pressure leakage. 【Easy to Store】These flat copper washers are designed with a storage box, making the sealing rings safer and more convenient to store, easy to carry and maintain good classification. This design will improve work efficiency. 【Wide Application】The O-rings are perfect for water, oil plugs, fuel and pipeline connections. The hydraulic sealing kit is perfect for electrical connections on household appliances, appliances, automobiles and marine applications. The ring washers are really good tools. 【What You Will Get】The flat washers include 30 pcs M5*9*1, 30 pcs M6*10*1, 20 pcs M6*12*1, 20 pcs M8*12*1, 20 pcs M8*14*1, 20 pcs M10*14*1, 20 pcs M12*16*1, 20 pcs M12*18*1.5, 20 pcs M14*18*1, which is enough for daily use. Product Description Advantages: The copper washers are made of high-quality copper, sturdy and durable for long-term use. Thanks to the exceptional copper material, the melting point of copper washers is up to 1083 ℃. Flat copper washers have good electrical and thermal conductivity. All gasket injectors are in a compartmentalized transparent plastic case, easy to use and carry. Our oil plug washer set is ideal for oil plugs, water, fuel and pipeline connections. The assorted copper washers are suitable for all types of engines, such as automotive, marine, generator, machinery. Specifications Product Name: Metal Washers Material: Copper Quantity: 200 pcs & Color Size: As the pictures show 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 Friendly Reminder Our O-rings are small parts, do not let children play to avoid accidental swallowing. Due to the light and screen difference, the color of the copper washers may be slightly different from the pictures.