Precision Twist Drill Jobber Length Drill Bit, Heavy Duty, Series: R10CO, Imperial, 1/4 in Drill - Fraction, 0.25 in Drill - Decimal Inch, 4 in Overall Length, 4XD Cutting Depth, 2 Flutes, Spiral Flute, 2-3/4 in Flute Length, 1/4 in Shank, Straight Shank, 135 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS-E Cutting Edge, No Through Coolant, HSS-E, Bronze Oxide, Applicable Materials: Magnetic Soft Steel, Structural Steel/Case Carburizing Steel, Plain Carbon Steel, Alloy Steel/Hardened and Tempered Steel, Free Machining Stainless Steel, Ferritic + Austenitic, Graphite/Malleable Cast Iron, Titanium, Nickel, Copper, Brass and Bronze