General Purpose Chicago-Latrobe Screw Machine Drill, Series: 157, Imperial, D Drill - Letter, 0.246 in. Drill - Decimal Inch, 2-1/2 in. Overall Length, 3XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 1-3/8 in. Flute Length, 0.246 in. Diameter x 1.125 in. Shank L. Straight Shank, 1 18 Degree Point, Radial Point, Right Hand Cutting Direction, HSS Cutting Edge, Bright, Applicable Materials: Alloy Steel, Carbon Steel, Cast Iron and Non-Ferrous Materials