Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, #31 - Wire, 0.12 in - Decimal Inch, 1-7/8 in Overall Length, 7/8 in Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 7/8 in Flute Length, 0.12 in Diameter x 1 in Length, 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