The DEWALT Extreme Flatwood 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 hard and soft wood, chipboard and other man made materials.This DEWALT Extreme Flatwood Drill Bit has the following specification: Diameter: 40mm.Length: 152mm.