IRWIN® Wood Auger Drill Bit 40 x 240mmThe 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