ThunderBit® Jobber Length Drill, Heavy Duty High Performance, Series: T3HD, Imperial, Z Drill - Letter, 0.413 in Drill - Decimal Inch, 5-1/4 in Overall Length, 3-7/8 in Cutting Depth, Spiral Flute, 3-7/8 in Flute Length, 135 deg Point, Split/Self-Centering Point, HSS Cutting Edge, Through Coolant: Yes, HSS, Black/Bronze Oxide, Applicable Materials: Alloy Steel, Cast Iron, Low and Medium Carbon Steel, High Alloy Steel, Steel, Stainless Steel, PH Steel, Tough, Medium and High Tensile Strength Alloy