Triumph® Aircraft Extension Drill, Heavy Duty, Series: T12HH, 1/8 in Drill - Fraction, 0.125 in Drill - Decimal Inch, 12 in Overall Length, 1-5/8 in Flute Length, 135 deg Point, Split Point, HSS, Black Oxide, Applicable Materials: Cast Iron, Low Medium Carbon and High-Tensile Strength Alloys and Steel