The DEWALT 1-in black oxide drill bit (1/2-in Shank) is designed to prevent problems before they happen, so you can concentrate on the job. The 135° split point drills on contact, so you never have to worry about a walking bit ruining your work. A parabolic flute design lets you get the job done as quickly as possible with improved chip ejection, but you never have to be concerned with over aggressiveness of true parabolic fluting thanks to the DEWALT® bit's 31° helix. The 1 In. bit is built to last, with a black oxide coating for enhanced wear resistance.