Tired of drill bits that dull quickly and snap under the slightest pressure. Then step up to Dewalt black oxide drill bits. These industrial grade twist drill bits are cut from super hard, resilient black oxide for the ultimate in durability and strength. Each bit features a 135 degree split point for enhanced hole drilling performance, including quick starts and clean, burr free holes. For use in wood, metal, plastics and fiberglass. 135 degree split point drills on contact and prevents walkingParabolic flute design improves chip ejection in metal and wood drilling applicationsBlack Oxide coated for greater wear resistanceHelix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute3in. flute length6in. overall length7/8in. diameter, 1/2in. shank