Irwin 4X Blue Groove Long Flat Wood Drill Bit

The Irwin Blue Groove 4X Long Flat Bit in 20mm x 400mm is an essential tool for larger diameter drilling applications in timber construction and plumbing installations. This diameter is perfect for creating holes for 22mm copper pipe, larger conduit runs, substantial cable installations, and M20 fixings through deep timber structures. The 20mm cutting diameter combined with the extended 400mm shank length makes this bit indispensable for plumbers, electricians, and construction professionals who need to drill through floor joists, wall studs, and roof timbers with substantial reach. The patented Blue Groove technology with its specially designed groove point cuts efficiently through timber rather than scraping, achieving drilling speeds up to 4 times faster than traditional flat bits. The parabolic scoop design ensures optimal chip evacuation, preventing binding and maintaining clean, accurate holes. With its reinforced shank that's 10% larger in diameter for superior durability and an enhanced 17° relief angle for improved cutting action, this bit delivers the reliable, high-speed performance required for demanding professional applications.