General description The Irwin 4X Blue Groove long flat bit is engineered for efficiency, featuring a patented groove point and cutting edge that allows it to cut timber four times faster than standard flat bits. Its design includes a parabolic scoop that enhances control and facilitates the removal of wood chips. Technical specifications Diameter: 8mm Length: 400mm Increased relief angle: from 12° to 17° Shank diameter: 10% larger than standard