Irwin Wood Auger Drill Bit

The Irwin IRW10502766 is a 20mm diameter auger drill bit with a 191mm overall length, representing a major size for substantial structural fixings, large-scale construction work, and heavy-duty joinery applications. This diameter is widely used for major coach screws, substantial structural bolts, and anywhere large clearance or through-holes are required in heavy timber construction and engineering projects. Engineered for all general wood boring, this auger bit delivers superior performance in robust large-diameter applications. The single spur cutting edge scribes the circumference of the hole for a smoother quality finish that meets structural requirements, whilst the hexagon shank prevents slipping in drill chucks or bit extensions even under the substantial torque generated by 20mm diameter drilling. The solid centre provides extra rigidity whilst boring, particularly critical with this diameter where maintaining straightness under high cutting forces is essential. The self-feeding screw point provides faster boring in both soft and hard woods, making large-diameter repetitive drilling more efficient and less physically demanding, and the fully hardened body from tip to shank provides extra durability under the demanding forces of substantial boring operations.