ThunderBit® Jobber Length Drill, Heavy Duty, Series: T8HD, 7/16 in Drill - Fraction, 0.4375 in Drill - Decimal Inch, 5-1/2 in Overall Length, 4-1/16 in Cutting Depth, 4-1/16 in Flute Length, 3/8 in Shank, Reduced Shank, 135 deg Point, Split Point, HSS Cutting Edge, HSS, Bronze/Black Oxide, Applicable Materials: Cast Iron, Low and Medium Carbon Steel, High Alloy Steel and Stainless Steel