Specification: Material: Copper Dimensions: 17.8 x 10.5 x 2.3 cm Melting point: up to 1083°C Notes: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2.Please allow slight dimension difference due to different manual measurement. Thank you for your understanding. Package Including: 60 x M5*9*1 Washers 60 x M6*10*1 Washers 40 x M6*12*1 Washers 40 x M8*12*1 Washers 40 x M8*14*1 Washers 40 x M10*14*1 Washers 40 x M12*16*1 Washers 40 x M12*18*1.5 Washers 40 x M14*18*1 Washers Premium Material ：- The gasket is made of high-quality copper, which has good strength and corrosion resistance, as well as good electrical and thermal conductivity, durable for daily use and can be used repeatedly. Washers ：- It can disperse the load to prevent damage from being repaired, and it can also isolate the steel screw from the surface. Washers are used to hold and distribute the load to the threaded area of ​​bolts and nuts to prevent pulling. Package ：- Contains 400pcs copper gaskets in 9 sizes, 60pcs M5*9*1 washers, 60pcs M6*10*1 washers, 40pcs M6*12*1 washers, 40pcs M8*12*1 washers, 40pcs M8*14*1 washers, 40pcs M10*14*1 washers, 40pcs M12*16*1 washers, 40pcs M12*18*5 washers, 40pcs M14*18*1 washers. Easy to Storage ：- These sealing washers are designed with a storage box, which make sump plug washers safer and more convenient to store, easy to carry, and keep well classification. Easy to Use ：- Copper gaskets are very easy to install. The smooth surface of flat copper gaskets can reduce friction between fasteners, prevent leakage, isolation, and prevent loosening or dispersing pressure.