Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, #23 Drill - Wire, 0.154 in - Decimal Inch, 2-1/16 in Overall Length, 1 in Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1 in Flute Length, 0.154 in Diameter x 1.0625 in L ShShAnco, Straight Shank, 135 Degree Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, TiN Coated, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel