- Complete set of 150 high-quality copper washers, ideal for DIY and repairs - Includes 15 different sizes (M5, M6, M8, M10, M12, M14, M16, M18, M20, M22) to suit various needs - Made of durable copper, with high electrical and thermal conductivity, and great durability - Withstand high temperatures and are resistant to corrosion - Flat and smooth surface for easy installation and reduced friction between fasteners - Prevent leaks, insulate, and avoid loosening or loss of pressure - Transparent storage box with compartments and labels for easy sorting and transport - Recommended for use in electrical connections, hydraulic systems, drain plugs, water, fuel, and industrial fittings