- MUSCCCM offers a complete copper washer kit, consisting of 280 pieces in 12 different sizes (M5 to M20), covering the most commonly used sizes for DIY and repairs - Made from high-quality copper, these washers provide excellent electrical conductivity and corrosion resistance, ensuring a safe and durable seal - They are ideal for applications in drain plugs, water systems, fuel, hydraulics, and electrical connections both at home and in automobiles and marine environments - The kit includes a practical transparent organizer box, making storage, transport, and quick identification of each size easy - A versatile and professional solution for hardware, maintenance, and repair tasks