Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, I Drill - Letter, 0.272 in - Decimal Inch, 2-11/16 in Overall Length, 3XD Depth of Cut, 2 Flute, Right Hand Spiral Flute, 1-1/2 in Flute Length, 0.272 in Diameter x 1.1875 in Length, Straight Shank, 135 Degree Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, Black Vapor Oxide, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel