Milwaukee® Jobber Length Twist Drill Bit, 12-Piece, Series: Thunderbolt®, Imperial, 11/64 in Drill - Fraction, 0.1719 in Drill - Decimal Inch, 3-1/4 in Overall Length, 2-1/8 in Cutting Depth, Parabolic Flute, 2-1/8 in Flute Length, 11/64 in Shank, Round Shank, 118 deg Point, Split Point, HSS Cutting Edge, HSS, Black Oxide, Applicable Materials: Cast Iron, Steel and Steel Forgings