Solid Carbide Spiral Flute Plunge Router Bits for Solid WoodSpiral 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 of the wood. Unique carbide grade for longer lifetime in abrasive materials Produces a superior finish and longer tool life Razor-sharp cutting edges/polished flutes' Can be used with hand-held, table-mounted portable routers and CNC machines Industrial qualitySpecially designed for speed and finish when working with solid wood. The combination of acute spiral flute shear angles with face ground helix yield high feed rates, fast plunge action, quick direction changes, deep penetration and mirror finish.