Dewalt extreme metal drill bits sets of 10 19 or 29 dewalt dt5929 qz p these 1 10mm drill bits from dewalt have been manufactured to a very high standard courtesy of the patented split pilot point design eliminates walking slipping on contact whether you are a professional tradesman or diy enthusiast the drill bits are ideal for portable drilling of steel alloyed and non alloyed up to 900n mm sup2 and for drilling a sheet or thin materials where accurate burr free holes are required