DeWalt QZ Extreme 2 Metal Drill Bits - 34-151mm - DEWALT DT5057-QZ, This 10.5 x 133mm drill bit from DeWalt has been manufactured to a very high standard courtesy of the innovative tapered web which greatly reduces breakage, while the gold ferrous oxide coating prevents overheating for longer bit life. Whether you are a professional tradesman or DIY enthusiast, the drill bit is ideal for portable drilling of steel, alloyed and non-alloyed up to 900N/mm², and for drilling a sheet or thin materials (suitable for use in wood and plastics). The metal tip starts drilling on contact for clean, accurate holes, while the bit itself has a no-slip shank with 3 flats, eliminating slipping in the chuck (diameters 5mm and above only). DEWALT DT5057-QZ Extreme 2 HSS-G Metal Drill Bit 10.5 x 133mm - Single