Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 559, Imperial, #54 - Wire, 0.055 in. Drill - Decimal Inch, 1-5/8 Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 5/8 Dia x 1 L Flute Length, Straight Shank, 135 OD. G Point, Split Point, Cutting Direction Right Hand, Cutting Edge M42 HSS-Co 8, M42 HSS-Co 8, Straw, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Tool Steel