[Quality] Made of copper, compared with steel and rubber gaskets, it has tighter sealing and high heat resistance. [Features] High conductivity, corrosion-resistant copper gasket classification, very suitable for sewage plugs, water, fuel and hydraulic accessories [Application] Widely used for electrical connection of household and commercial electrical appliances, automotive and marine power supplies have screw/bolt connection devices [List] Contains 320 pieces/12 sizes of the most commonly used copper washers. They are very convenient to install. The washers have a smooth surface, which can reduce the friction between the screw and the nut, prevent leakage, isolation, and prevent loosening or dispersing pressure colour: gold Material: Package Contents: 40 x 5x9x1mm washers 35 x 6x10x1mm washers 35 x 6x12x1mm washers 30 x 8x13x1mm washers 30 x 10x14x1mm washers 30 x 8x14x1mm washers 25 x 12x16x1mm washers 25 x 14x18x1mm washers 20 x 12x18x1.5mm washers 20 x 16x20x1.5mm washers 15 x 16x22x1.5mm washers 15 x 20x26x1.5mm washers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.