Solid Carbide Spiral Plunge Router BitsSpiral bits combine a shearing action in cutting with an augering action in chip clearance. The shearing action yields an especially clean & accurate cut, while the augering action clears chips from the cut. The "down-cut" cuts from the surface down, leaving a smooth edge at the surface.Unique carbide grade for longer lifetime in abrasive materialsProduces a superior finish and longer tool lifeRazor-sharp cutting edges/polished flutes'Can be used with hand-held, table-mountedportable routers and CNC machinesIndustrial qualityThese router bits are great for production settings and excellent for creating grooves and dado cuts in plywood and composite materials. Primarily used on CNC machines and other automatic routers.Note: Item #46229, #46231, #46402, #46403, #46237, #46239 and #46235 - Due to small diameter, these bits are not guaranteed against breakage.