Lenox 1864904 Pilot Drill Bit for Hole Saw Arbors (Pack of 25), 3 1/4" Constructed from hardened carbon steel Black oxide resists corrosion. The split-point pilot drill penetrates quickly, self-centers, and won't "walk" across the work surface Use with 1L and 4L Solid Hex Arbors and 2L Hollow Hex Arbors.