Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, A Drill - Letter, 0.234 in Drill - Decimal, 2-7/16 in Overall Length, 1-5/16 in Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1-5/16 in Flute Length, 0.234 in Diameter A x 1.125 in L-Shank, Straight Shank, 135 Degree Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS Coating, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron, and Tool Steel