This pack includes 10 copper washers designed as solid gaskets for sump oil seals and related sealing applications. Each washer measures 6x12x2 mm (inner diameter 6 mm, outer diameter 12 mm, thickness 2 mm). Key features Material and construction: Copper washers, solid gasket form for reliable sealing in oil environments. Size and fit: 6x12x2 mm with an inner diameter of 6 mm, outer diameter of 12 mm, and a thickness of 2 mm. Pack quantity: 10 pieces per pack, ready for multiple service events. Sealing performance: Copper provides good malleability to form a tight seal when compressed by fasteners, helping prevent leaks in sump and fluid connections. Compatibility: Suitable for standard M6 bolt/drain plug assemblies and other common sealing interfaces that use 6 mm ID copper washers. Benefits and why you need them Improves leak prevention in oil sump drains and similar fluid seals by providing a metaltometal gasket that deforms to fill gaps. Resistant to oil and many automotive fluids, offering dependable performance under typical operating temperatures. Durable and corrosionresistant copper construction ensures consistent sealing over time when used as a replacement washer. Typical applications Automotive engine oil sump drain plug seals Small engine sumps and gearboxes that use copper sealing washers Hydraulic line and other fluid connections requiring a copper gasket with a 6 mm inner diameter Usage guidance Use a copper washer with each oil change or service to ensure sealing. Place the washer between the bolt head and the sealing surface, then tighten to the manufacturer's specification to achieve a proper seal. Inspect for deformation or damage; if the washer is nicked, cracked, or crushed. Care and storage Store in a dry, clean area to prevent oxidation or contamination. Handle and install with care to avoid bending or gouging the washer surface. This description reflects the product's stated features: 10 pieces per pack, copper solid gasket washers sized 6x12x2 mm, intended for sump oil seal and related sealing applications, with appropriate notes on use, compatibility, and care.