The Lenox Tools 1779810 3.25-Inch Pilot Drill Bit for Hole Saw Arbors is a black oxide 1/4-Inch Diameter Drill bit with a 135-degree split point tip, designed to get the hole started quickly and accurately. This pilot bit allows you to line up the hole saw and guide it through the material you are cutting. The pilot drill bit works with most hole saw arbors and hole saws. It is designed to work with metal and wood.