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🌟【High quality copper】The seal is made of solid copper, which is heat and high pressure resistant and has a melting point of up to 1083 °C. Ideal for oil tub plugs and hydraulic accessories. 🌟【Wide Application】O-shaped copper discs are ideal for electrical connections in houses, cars, ships, commercial appliances, generators, mechanical appliances, etc. 🌟【Product Features】Flat lining discs have smooth surface and good ductility, which can enlarge the contact area and used with screws, to reduce friction between fastening elements and to prevent pressure transmission or distribution. 🌟【Size and Quantity】The copper seal set contains 320 parts, 12 sizes, including the most commonly used copper seal sizes (M5 M6 M8 M10 M12 M14 M16 M20). 🌟【Practical Storage Box】The copper discs are stored in plastic boxes for easy storage and transport in categories.