Titan USA Taper Shank Drill Bit, General Purpose Heavy Duty, Series: 550, Imperial, 29/64 in Drill - Fraction, 0.4531 in Drill - Decimal Inch, 7-1/2 in Overall Length, 4-1/8 in Cutting Depth, 2 Flutes, Spiral Flute, 4-1/8 in Flute Length, #1 Morse Taper Shank Taper Designation, 118 deg Point, Standard Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Uncoated, Applicable Materials: Steel, Stainless Steel, Cast Iron, Titanium, Nickel, Copper, Aluminum, Magnesium and Synthetic Materials