FeaturesVersatile - reduced shank diameter for use in 1/2 in chucksCorrosion-resistant - black oxide coating provides lubricity and resists corrosion of the bitReduced slipping - 3-flat Secure Grip™ shank holds the bit firmly in the chuckFast, accurate drilling - 135 deg split point tip starts on contact to prevent walking, while the parabolic flute clears chips fast