Chicago-Latrobe - Screw Machine Drill, Heavy Duty, Series: 159-TN/2159, Imperial, #57 Drill - Wire, 0.043 in Drill - Decimal, 1-3/8 Overall Length, 1/2 Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1/2 Flute Length, 0.043 Diameter, 875 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