The DEWALT 13 Piece Extreme 2 Drill Bit Set contains a variety of metal drill bits suitable for rotary hammer or cordless drills. The Extreme 2 HSS-G bits offer greater durability and speed up to 50% stronger (vs HSS-R) and up to 4X faster drilling (vs HSS-R). The strong central core offers a tapered web which greatly reduces breakage whilst the gold ferrous oxide coating prevents overheating for longer bit life. The no walk tip offers easy starting on curved surfaces for cleaner more accurate burr-free holes due to recessed cutting wings. The no-slip shank with 3 flat sides eliminates slipping in the chuck (diameters 5.0mm and above only). The modular stackable small tough case has been designed for secure storage of accessories. The clear lid offers easy identification and easy bit removal and replacement. Use the locking system to connect the cases together and securely stack on top of the medium Toughcase.