Precision Twist Drill Taper Shank Drill Bit, Heavy Duty, Series: 209CO, Imperial, 1/4 in Drill - Fraction, 0.25 in Drill - Decimal Inch, 6-1/8 in Overall Length, 4XD Cutting Depth, 2 Flutes, Spiral Flute, 2-7/8 in Flute Length, #1 Morse Taper Shank Taper Designation, 135 deg Point, Notched Point, Right Hand Cutting Direction, HSS-E Cutting Edge, No Through Coolant, HSS-E, Bronze Oxide, Applicable Materials: Steel, Stainless Steel, Cast Iron, Titanium, Nickel, Copper, Aluminum Magnesium, Synthetic Materials, Hard Materials and Graphite