NAVAC NTF66C Flaring Tool and Tube CutterPrecise Flaring Every Time.NAVAC NTF66 Flaring Tool, with axial spacing and patented rivet connection, delivers consistent, accurate flaring each and every time. Nitride treatment makes it more robust and durable.Tubing O.D. - 1/4", 5/16", 3/8", 1/2", 5/8", 3/4"