Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, #46 - Wire, 0.081 in - Decimal Drill, 1-3/4 in Overall Length, 3/4 in Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 3/4 in Flute Length, 0.081 in Diameter x 1 in Diameter x 1 in Length Shank, Straight 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