Feature:1. Made of high-quality copper, sealing washer's melting point is up to 1083 ℃, which is durable.2. With good electrical and thermal conductivity, copper gasket's quality is guaranteed, you can use it with confidence.3. And such gasket is suitable for oil pan plug, water, fuel and liquid pressure connector, easy to use.4. Built to strict quality control standards, copper washer design is improved for more practical adoptability.5. No extral step is required when you use such fastener and the operation is simple.Specification:Item Type: Copper gasketMaterial: CopperQuantity: 200PCs / 280PCs (optional)Product Number:200PCsSize: (Inner Diameter x Outer Diameter x Thickness)M5 x 9 x 1mm 30pcsM6 x 10 x 1 mm 30pcsM6 x 12 x 1 mm 20pcsM8 x 12 x 1 mm 20pcsM8 x 14 x 1 mm 20pcsM10 x 14 x 1 mm 20pcsM12 x 16 x 1 mm 20pcsM12 x 18 x 1.5 mm 20pcsFor M14 x 18 x 1 mm 20pcs280PCsSize: (Inner Diameter x Outer Diameter x Thickness)M5 x 9 x 1 mm 30pcsM6 x 10 x 1 mm 30pcsM6 x 12 x 1 mm 20pcsM8 x 12 x 1 mm 30pcsM10 x 14 x 1 mm 30pcsM8 x 14 x 1 mm 20pcsM12 x 16 x 1 mm 25pcsFor M14 x 18 x 1 mm 25pcsM12 x 18 x 1.5 mm 20pcsFor M16 x 20 x 1.5 mm 20pcsFor M16 x 22 x ​​1.5 mm 15pcsM20 x 26 x 1.5 mm 15pcs.Package List:Size: (Inner Diameter x Outer Diameter x Thickness)30 x (M5 x 9 x 1mm) Copper Gasket30 x (M6 x 10 x 1 mm) Copper Gasket20 x (M6 x 12 x 1 mm) Copper Gasket20 x (M8 x 12 x 1 mm) Copper Gasket20 x (M8 x 14 x 1 mm) Copper Gasket20 x (M10 x 14 x 1 mm) Copper Gasket20 x (M12 x 16 x 1 mm) Copper Gasket20 x (M12 x 18 x 1.5 mm) Copper Gasket20 x (For M14 x 18 x 1 mm) Copper Gasket