Dewalt qz flatwood drill bits 160mm dewalt dt4824 qz this 24 x 160mm drill bit from dewalt has been manufactured to a very high standard courtesy of the quality chrome vanadium flat drill bit range featuring a ground central point and cutting edges for accurate location and clean cutting also featuring a ground chip breaker to reduce splintering therefore providing relatively clean holes and improved drilling efficiency ideal for either the profressional tradesman or diy enthusiast offe