Description: Aluminum alloy automatic transmission fluid drain plug crush washer seal. Ensuring proper fit with the drain plug and creating a tight seal. Ideal for oil changes and oil filter replacements. This oil drain plug crush gasket washers is for most of car. O.D.(outside diameter): 18mm, I.D.(inside diameter): 10mm, Thickness: 2mm. Notes: Please allow 0.3-0.5 mm error due to manual measurement.