An assortment of metric serrated flange nut variants from The Hillman Group. Flange nuts are hex nuts with a scored, or serrated, built-in washer to resist vibration. The flange distributes the pressure of the nut, which reduces the chance of damage and makes it less likely to loosen. Variants included in this assortment range from M3-0.50 to M20-2.50 in coarse thread size. Full assortments of #33709 contain ten (10) refills comprised of Hillman item numbers #33710 - #33720.