Powerbuilt Flare Nut Wrenches are made from Chrome Vanadium steel for added durability. The double open ends provide a 6 point connection for many common hose fittings, brass fittings and more. The flare nut design allows these wrenches to be used on hoses and tubing to easily side onto these types of fittings commonly found on automobile, HVAC and other similar applications. Perfect for automotive line fittings and plumbing applications.