Triumph® Aircraft Extension Extra Length Drill, Heavy Duty, Series: T6HH, 15/64 in Drill - Fraction, 0.2344 in Drill - Decimal Inch, 6 in Overall Length, 2-5/8 in Cutting Depth, 2-5/8 in Flute Length, 135 deg Point, Split/Self-Centering Point, HSS Cutting Edge, HSS, Black Oxide, Applicable Materials: Alloy Steel, Cast Iron, Low and Medium Carbon Steel, High Alloy Steel, Tough, Medium and High Tensile Strength Alloy