Triumph® Aircraft Extension Drill, Extra Length Heavy Duty, 3/8 in Drill Size - Fraction, 0.375 in Drill Size - Decimal Inch, 6 in Overall Length, 3-5/8 in Cutting Depth, 2 Flutes, 3-5/8 in Flute Length, Straight Shank, 135 deg Point, Split Point, HSS Cutting Edge, HSS, Black Oxide, Applicable Materials: Cast Iron, Low and Medium Carbon Steel, High Alloy Steel, Stainless Steel, Precipitation Hardened Steel and Wood