Irwin 4X Blue Groove Flat Wood Drill Bit

The 13mm IRWIN® Blue Groove 4X Flat Bit provides a specialist size perfect for precise applications where standard increments don't quite suit the requirement. This diameter is particularly useful for custom joinery work and when creating holes for specific hardware or fittings in timber. Featuring the patented groove point and cutting edge technology, this 13mm bit cuts through timber cleanly and accurately without scraping, ensuring professional results every time. The advanced design delivers speeds up to 4 times faster than standard flat bits, dramatically improving efficiency. The parabolic scoop design provides excellent chip removal and superior control throughout the drilling operation. With an increased relief angle of 17° for optimal cutting performance and a robust 152mm shank manufactured 10% larger in diameter, this bit is built for demanding professional applications. The enhanced construction resists bending and maintains accuracy even under sustained use, making it a reliable choice for trade professionals.