Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, 31/64 in - Fraction, 0.4844 in - Decimal Inch, 3-11/16 in Overall Length, 3XD Depth of Cut, 2 Flute, Right Hand Spiral Flute, 2-3/16 in Flute Length, 31/64 in Diameter x 1-1/2 in L Shank, Straight Shank, 135 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