The Irwin IRW10502779 is a long series 28mm diameter auger drill bit with an extended 400mm overall length, specifically engineered for deep boring applications requiring this major structural hole diameter. This specialist bit is essential for substantial structural timber work, major services routing through thick beams, heavy engineering applications, and major construction projects where both large diameter and extended reach are critical.
Designed for all general wood boring, this long auger bit offers superior performance under the most demanding large-diameter structural conditions. The single spur cutting edge scribes the circumference of the hole for a smoother quality finish throughout the full depth of major bores, whilst the hexagon shank prevents slipping in drill chucks or bit extensions during prolonged, heavy-duty structural drilling sessions.
The solid centre provides extra rigidity whilst boring, absolutely critical for maintaining straightness when drilling 28mm diameter holes at considerable depth through major structural timbers. The self-feeding screw point provides faster boring in both soft and hard woods whilst maintaining tracking accuracy in substantial deep holes, and the fully hardened body from tip to shank provides extra durability under the considerable forces generated during deep, large-diameter structural operations.
Features and Benefits: • 28mm diameter with 400mm length for major deep structural applications • Long series design essential for substantial structural and engineering work • Single spur cutting edge maintains structural quality throughout deep large holes • Solid centre prevents deflection under considerable forces at depth • Self-feeding design maintains control whilst reducing substantial operator fatigue • Fully hardened body ensures maximum reliability in the most demanding work Specifications: Diameter (mm): 28 Overall Length (mm): 400 Working Length (mm): 335 Pack Qty.: 1