General description The Irwin long auger wood drill bits are designed for general wood boring, offering superior performance. The single spur cutting edge scribes the circumference of the hole, resulting in a smoother quality finish. The hexagon shank prevents slipping in a drill chuck or bit extension, while the solid center provides extra rigidity during boring. The self-feeding screw point allows for faster boring in both soft and hard woods, and the fully hardened body from tip to shank ensures extra durability. Technical specifications Drill bit diameter: 18.0mm Total length: 400mm Working length: 323mm