The Irwin auger wood drill bit has been designed for all general wood boring and offers a superior performance. The single spur cutting edge scribes the circumference of the hole for a smoother quality finish. The hexagon shank prevents slipping in a drill chuck or bit extension. The solid centre provides extra rigidity whilst boring, the self-feeding screw point provides faster boring in both soft and hard woods and the fully hardened body from tip to shank provides extra durability. The Irwin IRW10502760 Auger drill bit has the following dimensions: Drillbit diameter: 17.0mm Total length: 191mm Working Length: 126mm IRW10502760