Dewalt extreme masonry drill bits 85 200mm dewalt dt6681 qz this 7 x 150mm drill bit from dewalt has been manufactured to a very high standard courtesy of the unique carbide grade maximising durability while the innovative tip design provides an efficient drilling action for greater accuracy whether you are a profressional tradesman or diy enthusiast the drill bit lasts up to twice as long and delivers up to 50 more holes per charge than a standard masonry bit providing cleaner more a