Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159, Imperial, #56 - Wire, 0.0465 in Drill - Decimal Inch, 1-3/8 Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1/2 Flute Length, 0.0465 in Diameter x 0.875 in L Straight Shank., 135 Degree Point, Split Point, Cutting Direction Right Hand, HSS Cutting Edge, HSS, Black Vapor Oxide, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel