Feature: The oil drain plug gasket is made of quality copper, have a tighter seal and high heat resistance than rubber washers, provides strength and offers good corrosion resistance in many environments. The washers' surface are smooth, which can reduces friction between the fasteners, prevents leakage, loosening or dispersion pressure. Sturdy and durable, great for automotive use, easy to install. Totally 5 different sizes gaskets storage in clear box, which can meet your different daily time use. Widely used in various environments pertaining to hydraulic fittings,water,fuel,and sump plugs. Specification: Condition: 100% Brand New Material: Copper Quantity: 29pcs Package Include:(inner diameter x outer diameter x thickness: mm ) 5pcs 10x18x1mm 8pcs 12x20x1mm 8pcs 14x22x1mm 5pcs 16x22x1mm 3pcs 18x24x1mm