An assortment of fiber automotive drain plug gaskets from The Hillman Group. Gaskets are mechanical seals which fill the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression. Variants featured in this assortment range from 12mm to 20mm in diameter, including three (3) 1/2" diameter variants. Full assortments of #58503 contain eight (8) refills comprised of Hillman item numbers #58504 - #58511.