ThunderBit® Reduced Shank Drill, Heavy Duty High Performance, Series: T9FHD, 1 in Drill - Fraction, 1 in Drill - Decimal Inch, 6 in Overall Length, Spiral Flute, 3 in Flute Length, 1/2 in Shank, 3-Flat/Reduced Shank, 118 deg Point, Split/Self-Centering Point, HSS Cutting Edge, HSS, Black/Bronze Oxide, Applicable Materials: Aluminum, Iron, Mild Steel and Steel