The Irwin long auger wood drill bits have been designed for all general wood boring and offer 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 IRW10502765 Auger bit - long series has the following dimensions:Drillbit diameter: 19.0mmTotal length: 400mmWorking Length: 323mmAdditional Information:• Diameter (mm): 19• Overall Length (mm): 400• Working Length (mm): 335• Pack Qty.: 1