Irwin 4X Blue Groove Flat Wood Drill Bit

The 16mm IRWIN® Blue Groove 4X Flat Bit is a highly capable size ideal for larger fixtures, substantial cable runs, and robust construction applications in timber. This diameter is particularly popular among electricians and carpenters for creating clearance holes for significant fittings and hardware. Featuring IRWIN's patented groove point and cutting edge, this 16mm bit cuts through timber with precision and efficiency rather than scraping, ensuring clean, accurate holes every time. The advanced design achieves speeds up to 4 times faster than standard flat bits, delivering substantial time savings on demanding projects. The parabolic scoop provides superior chip removal and excellent control, even when drilling deeper holes. With an increased relief angle of 17° for enhanced cutting performance and a robust 152mm shank manufactured 10% larger in diameter, this bit is engineered for professional durability. The strengthened construction maintains accuracy and resists bending under intensive use, making it suitable for the most demanding trade applications.