Chicago-Latrobe Taper Length Drill, General Purpose, Series: 120, L-Shaped Drill - Letter, 0.29 in. Drill - Decimal Inch, 6-3/8 in. Overall Length, 4 in. Depth of Cut, Spiral Flute, 4 in. Flute Length 0.29 in., Straight Shank, Conventional Point, HSS Cutting Direction, HSS, Black Oxide, Applicable Materials: Carbon Steel, Alloy Steel, and Cast Iron