The irwin blue groove 4x flat bit delivers cutting performance four times faster than standard flat bits through advanced engineering and precision-ground geometry. The patented groove point and cutting edge are designed to cut cleanly through timber rather than scrape. The parabolic scoop optimises chip removal and maintains control throughout the drilling process. The increased relief angle from 12 to 17 improves cutting efficiency in demanding applications. The 152mm shank features a 10% larger diameter for improved durability during operation. This 28mm flat bit is engineered for professional tradespeople and demanding workshop environments requiring fast, clean drilling in timber. Features & benefits: cutting speed four times faster than standard flat bits for increased productivity. Patented groove point and cutting edge cut cleanly rather than scrape timber surfaces. Parabolic scoop design optimises wood chip removal and drilling control. Relief angle increased from 12 to 17 for improved cutting efficiency. 10% Larger shank diameter delivers improved durability during use. Suitable for professional carpentry, joinery, construction and workshop applications requiring precision timber drilling. Diameter: 28mm. Length: 152mm.