The DEWALT Black Gold Metal Drill Bits feature a black and gold coating for preventing rust. The tapered web design provides extreme durability to resist breakage. The bits feature a 3-flats shank to reduce spin-out in the chuck. The Black Gold metal drill bits are made of heavy-duty High Speed Steel for drilling into a variety of materials including plastic, wood, and metal. Each bit features a 135 split point tip design to help reduce walking. 135 Degree Split point tip design to help reduce walking High Speed Steel to be used in plastic, wood, and metal Tapered web design for extreme durability and resisting breakage Black and gold coating to help prevent rust and wear 3-Flats shank to reduce spin-out in the chuck *Size markings on the drill bit shank for identifying sizes quickly