This flare fitting set is great for DIY enthusiasts and professionals working on plumbing or fluid - transfer projects. It's easy to use when you need to connect 3/16' tubing to threaded quick disconnects or other 1/4' male flare fittings. The set includes a 1/4 in. nut and a 1/4 in. barb. The barb is made of stainless steel and the nut is chrome - plated brass for durability.