This product is a pack of 10 copper washer solid gaskets designed for sealing oil systems and other fluid connections. Each washer is 12x24x2 mm (inner diameter 12 mm, outer diameter 24 mm, thickness 2 mm). The pack contains 10 pieces. Key benefits Reliable oil seal: Copper washers provide an effective seal when compressed between mating surfaces, helping to prevent leaks in oil systems. Durable in oily environments: Copper resists corrosion and performs well under typical automotive oil conditions. Precise sizing for compatibility: 12x24x2 mm dimensions fit common 12 mm bolt and fitting configurations, making replacement straightforward. Simple, onepiece design: Solid gasket construction eliminates the need for multiple components and reduces leak points. Versatile usage: Suitable for sump oil seals and other fluid connections requiring a copper sealing washer. Key attributes Material: copper Quantity: 10 pieces per pack Inner diameter: 12 mm Outer diameter: 24 mm Thickness: 2 mm Type: solid gasket / washer seal Application: sump oil seal and general fluid sealing in automotive and industrial settings Compatibility and performance Functional with 12 mm bolts and fittings commonly used in automotive oil drain plugs and small engine sump seals. Provides a reliable seal in oil systems and other fluid connections where copper washers are suitable. Durable under typical engine and hydraulic system temperatures and pressures, offering consistent sealing performance. Use cases and applications Replacing worn copper washers on automotive oil drain plugs during routine oil changes to restore proper sealing. Acting as a sump oil seal or gasket for small engine oil pans, motorcycles, ATVs, generators, and similar equipment. Sealing hydraulic fittings or fluid connections that use 12 mm bore or 12 mm bolt sizing, where a copper washer is appropriate. Care and handling Store in a dry environment to prevent oxidation and corrosion. Do not overtighten fasteners to avoid deforming the washer and compromising the seal. Use clean, compatible surfaces to ensure a proper seal and prevent scoring of mating surfaces.