?Premium Red Copper Material?Made from 100% pure red copper for superior durability, heat resistance up to 350°C (662°F), and excellent corrosion resistance. Ensures reliable sealing performance. ?200PC Professional Set?Complete assortment of 9 popular metric sizes. Perfect for automotive repair, industrial maintenance, and professional mechanics ?High-Pressure Rating?Engineered to withstand pressures up to 16 MPa. Provides superior sealing compared to standard steel or rubber washers. Ideal for hydraulic and high-temperature applications. ?Organized Storage?Includes durable plastic case with labeled compartments for easy size identification and access. Keep your washers organized and protected. ?Universal Applications?Perfect for oil drain plugs, hydraulic fittings, fuel lines, water pipes, and general automotive maintenance. Essential for professional mechanics and DIY enthusiasts. Upgrade your sealing and fastening solutions with our comprehensive 200-piece copper washer assortment kit! This kit features high-quality red copper washers, offering superior performance and durability compared to steel or rubber alternatives. Red copper's excellent heat resistance (up to 350°C), high conductivity, and corrosion resistance make it ideal for demanding applications. This kit includes 200 washers in 9 popular sizes, ensuring you have the right washer for various projects: M5 x 10 x 1mm - 30pcs M6 x 10 x 1mm - 30pcs M6 x 12 x 1mm - 20pcs M8 x 12 x 1mm - 20pcs M8 x 14 x 1mm - 20pcs M10 x 14 x 1mm - 20pcs M12 x 16 x 1mm - 20pcs M12 x 18 x 1.5mm - 20pcs M14 x 18 x 1mm - 20pcs The washers provide a tighter seal and greater heat endurance than steel and rubber washers, preventing leakage and loosening under high pressure (up to 16 MPa). They're perfect for use in industrial, automotive, marine, hydraulic, and household applications, including sump plugs, water, fuel, and hydraulic fittings. The durable, transparent storage case with a size chart ensures convenient organization and portability.