Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, Q Drill - Letter, 0.332 in Drill - Decimal Inch, 3 in Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1-11/16 in Flute Length, 0.332 in Diameter x 1.3125 in L Straight Shank, 135 Graduation 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