Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, #49 - Wire, 0.073 in - Decimal Inch, 1-11/16 in Overall Length, 11/16 in Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 11/16 in Flute Length, 0.073 in Diameter ax 1 in x 1 in L-Shank, Straight Shank, 135 Degree Point, Parting Point, Right Hand Cutting Direction, HSS Cutting Edge, TiN Coated, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel