Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 559-TN/2559, Imperial, 21/64 in - Fraction, 0.3281 in - Decimal Inch, 2-15/16 in Overall Length, 1-11/16 in Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1-11/16 in Flute Length, 21 /64 in Diameter x 1.25 in Length, Straight Shank, 135 Degree Point, Split Point, Right Hand Cutting Direction, M42 HSS-Co 8 Cutting Edge, M42 HSS-Co 8, TiN Coating, Applicable Materials: Carbon Steel, Cast Iron and Tool Steel