Triumph® Aircraft Extension Drill, Heavy Duty, Series: Z Series, 7/32 in Drill Size - Fraction, 0.2188 in Drill Size - Decimal Inch, 6 in Overall Length, 2-1/2 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