General description These 150pcs Copper Washers Gasket Sealing Ring are made from solid copper, providing excellent electrical and thermal conductivity. The assortment kit includes various sizes of flat washers, ideal for use with nuts and bolts to prevent damage to the attached hardware. Technical specifications Material: Copper Color: Yellow Number of Pieces: 150 Melting Point: Up to 1083℃ Sizes Included: M5, M6, M7, M8, M10, M10.5, M11, M12, M12.5, M14, M15, M16, M16.5, M17.5 Usage Suitable for sump plugs, water, fuel, and hydraulic fittings. Compatible with all types of engines including cars, marine engines, generators, machinery, and plants. Other information Washers are arranged in a compact, glass-fronted plastic box for easy organization and access.