Changing of pilot nose and cutter allows one tool to cover a range of tube sheet bore diameters. Features of NW Series Grooving Tool Changing of pilot nose and cutter allows one tool to cover a range of hole diameters. Simple to change cutter for different groove shapes. Location and depth of cut easy to adjust. Only light pressure required to cut precision grooves. Ready to fit CNC drill machines, lathes and boring machines. The life of the cutter of this grooving tool is extendable by re-sharpening.