General Purpose Chicago-Latrobe Screw Machine Drill, Series: 157, Imperial, #57 Drill - Wire, 0.043 in. Drill - Decimal Inch, 1-3/8 in. Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1/2 in. Flute Length, 0.875 in. Diameter, Straight Shank, 118 Degree Point, Radial Point, Right Hand Cutting Direction, HSS Cutting Edge, Bright, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Non-Ferrous Materials