General description The Irwin Blue Groove 4X Flat Bits feature a patented groove point and cutting edge designed to cut wood efficiently, achieving speeds four times faster than standard flat bits. The innovative parabolic scoop enhances control and facilitates the removal of wood chips. Technical specifications Diameter: 35mm Shank length: 152mm Shank diameter: 10% larger than standard for added durability Increased relief angle: 17° (up from 12°)