Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, 1/2 Inch Drill - Fraction, 0.5 Inch Drill - Decimal Inch, 3-3/4 Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 2-1/4 Flute Length, 1/2 Dia. x 1-1/2 L. Shank, Straight Shank, 1 35 Degree Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Black Vapor Oxide, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel