Black Oxide drill bits from DeWalt are ideal for general applications including drilling in non-ferrous metal, wood, and plastic. They have a 135 degree split point for quick start and no walk applications. The parabolic flute design improves chip ejection in metal and wood drilling applications. Because of the wide variety of applications covered, black oxide drill bits are found in most residential and commercial tool boxes. 11/32", Black Oxide Drill Bit, 135 Degree Split Point Drills On Contact & Prevents Walking, Patented Core Diameter Reduces Breakage, Black Oxide For Greater Wear Resistance.