Irwin 4X Blue Groove Long Flat Wood Drill Bit

The Irwin Blue Groove 4X Long Flat Bit in 19mm x 400mm provides precise drilling capability for applications requiring this specific larger diameter through deep timber sections. The 19mm size is frequently specified for particular plumbing installations, larger electrical runs, specialist fixings, and construction applications where this exact sizing is critical. This bit incorporates the advanced Blue Groove technology with its patented groove point and cutting edge design that cuts cleanly through timber rather than scraping, delivering drilling performance up to 4 times faster than conventional flat bits. The 400mm extended shank provides essential reach for drilling through floor joists, multiple wall studs, roof timbers, and other deep timber structures. The parabolic scoop optimises wood chip removal and maintains excellent control, ensuring accurate, clean holes even during prolonged drilling operations. Featuring a 10% larger diameter shank for enhanced strength and an improved 17° relief angle for smoother, more efficient cutting, this bit delivers the professional-grade performance and durability that experienced tradespeople require from their drilling tools.