General description The Irwin Blue Groove 4X Flat Bits feature a patented groove point and cutting edge designed to cut timber efficiently, achieving speeds 4 times faster than standard flat bits. The parabolic scoop enhances control and facilitates the removal of wood chips. Technical specifications Diameter: 38mm Length of shank: 152mm Increased relief angle: 17° (up from 12°) Shank diameter: 10% larger than standard for added durability Usage These flat bits are ideal for drilling into wood, providing a clean cut without scraping the surface.