These 10 copper washers serve as solid gaskets for sealing sump oil plugs and similar fittings. Each washer is designed to deform slightly under tightening to create a reliable oil seal. Key features Material: Copper Type: Solid gasket / copper washer Size: 6x18x2 mm (inner diameter 6 mm, outer diameter 18 mm, thickness 2 mm) Quantity: 10 pieces per pack Function: Seals oil connections by forming a metaltometal seal when compressed Performance: Copper provides good malleability and oil resistance for durable sealing Attributes and compatibility Functionality: Crushable copper washer that deforms to seat against the mating surface and stop to prevent leaks Compatibility: Designed for applications requiring a 6 mm inner diameter and 18 mm outer diameter copper washer with a 2 mm thickness Material: Copper Size precision: 6x18x2 mm, suitable for standard drain plug and fitting seals in automotive and machinery contexts Applications and use cases Automotive engine oil drain plug seals: used between the drain bolt and oil pan to prevent oil leaks Motorcycle oil drain plugs: suitable for bikes that specify 6x18x2 mm copper sealing washers Gearbox or differential drain plugs and other fittings: appropriate for systems that require a 6 mm inner bore and 18 mm outer diameter copper washer installation and maintenance tips Ensure mating surfaces are clean and of debris before installation Use a copper washer for every service; reuse can lead to leaks Tighten to the appropriate torque specification for your application to achieve a proper seal Packaging and contents Pack quantity: 10 pieces Notes These washers are designed for oil sealing applications where a 6x18x2 mm copper washer is specified Suitable for sump oil seal use and similar sealing needs in automotive and machinery contexts