Allstar Zinc Plated 1/2-20 Thread for 5/16 inch Fuel Line Inverted Flare Nut (Pack of 10) features an inverted flare nut that has 1/2-20 threads for a 5/16 inches fuel line. The finish is a quality stainless finish. The inverted flare nuts are used for building custom length fuel lines. It is sold as one set of 10 pieces. It is backed by a 90-day limited factory warranty.