Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, H Drill - Letter, 0.266 in. Drill - Decimal Inch, 2-11/16 in. Overall Length, 1-1/2 in. Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1-1/2 in. Flute Length, 1.18 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