DEWALT Extreme Flat Wood Drill Bits have an extra thick robust steel shank for outstanding durability and 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 the rapid drilling of holes in wood, for door locks, mortising, electrical and plumbing work. Suitable for natural hardwood and softwood, chipboard and other man-made materials. Supplied in a TOUGH CASE+, this is part of a connectable case system that is TSTAK compatible. Individual TOUGH CASES can be clipped together for easy transportation. This 9 Piece Set contains the following sizes 12, 14, 16, 18, 20, 22, 25, 28 and 32mm.