Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, A Drill - Letter, 0.234 in. Drill - Inch Decimal, 2-7/16 in. Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1-5/16 in. Flute Length, 0.234 in. Diameter x 1.125 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