Irwin® Aircraft Extension High Speed Steel Fractional Straight Shank Drill Bit is ideal for drilling in hard-to-reach areas and for running wires and cable. Bit is constructed of M-2 high speed steel for the best combination of strength, heat resistance, and wear resistance. Black oxide coating resists corrosion. 135 degree split point ensures a true start and eliminates bit walking. For general use in wood, metal, and plastic.