Triumph® Jobber Length Drill Bit, General Purpose, Series: T3B, Imperial, R Drill - Letter, 0.339 in Drill - Decimal Inch, 4-3/4 in Overall Length, 3-7/16 in Cutting Depth, 3-7/16 in Flute Length, 118 deg Point, HSS Cutting Edge, HSS, Black Oxide, Applicable Materials: Aluminum/Aluminum Alloys, Wood, Plastic, Soft and Medium Bronze