Irwin 4X Blue Groove Long Flat Wood Drill Bit

The Irwin Blue Groove 4X Long Flat Bit in 16mm x 400mm is an excellent choice for medium to larger diameter drilling applications in timber construction and joinery. This versatile size is ideal for creating holes for 15mm copper pipe with clearance, electrical conduit, M16 fixings, and various plumbing and mechanical installations through deep timber sections. The 16mm cutting diameter combined with the extended 400mm shank makes this bit particularly valuable for drilling through floor joists for pipework, creating cable routes through wall studs, and other applications requiring substantial reach. The patented Blue Groove technology with its specially designed groove point cuts cleanly through timber rather than scraping, delivering drilling speeds up to 4 times faster than conventional flat bits. The parabolic scoop design optimises chip removal, ensuring smooth operation and preventing binding. Featuring a 10% larger diameter shank for superior strength and an enhanced 17° relief angle for improved cutting efficiency, this bit provides the performance and durability required for intensive professional use.