Dewalt dt7943b extreme flatbit in tough case set of 8 dewalt dt7943b qz p this set of extreme flatbits from dewalt have an extra thick robust steel shank for outstanding durability and bit life plus chamfered outer cutting spurs for clean very fast drilling and extended drilling life the precision ground central point has an optimised design for faster material penetration and increased drilling speed ideal for rapid drilling of holes in wood for door locks mortising electrical and