Irwin 5/16 x 6 in. M-2 Black Oxide Extended Length Drill Bit is designed for drilling in hard-to-reach areas, making it for running wires and cable. Crafted from M-2 high speed steel, this drill bit an excellent balance of strength, heat resistance, and wear resistance. Its black oxide coating provides reliable corrosion resistance, ensuring durability over time. The 135-degree split point s a precise start and prevents bit walking, enhancing accuracy and ease of use. Suitable for general drilling applications in wood, metal, and plastic, this extended length drill bit is a versatile addition to any toolbox. Model Number: 66720ZR