IRWIN 1890710 Straight Shank Installer Drill Bit for Wood, 18-Inch by 7/16-Inch 82 point for fast, smooth drilling in wood Hole in flute for easy wire pulling through walls, ceilings and floors 3-flatted shank prevents slipping in drill chuck and includes hole for wire pulling Hole not included on 12" length bits Premium high carbon steel construction for extended drilling life in wood