Black Oxide Coated Economy High Speed Steel Metric Straight Shank Jobber Length Drill Bits 13.00 mm Size. 4-1/2" Twist Length. 6" Overall Length. Bulk. Bit is constructed of M-2 high speed steel for the best combination of strength, heat resistance, and wear resistance Standard 118 degree point for use in wood, metal, and plastic Black oxide coating resists corrosion