Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, #49 - Wire, 0.073 in. Drill - Decimal Inch, 1-11/16 in. Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 11/16 in. Dia. Flute Length x 1 in. Ank, 135 Split Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Black Vapor Oxide, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel