Solid Carbide Spektra Extreme Tool Life Coated Mortise Compression Spiral Router Bits feature unique, harder carbide with nACo nanocomposite coating for longer tool lifetime. Note: Spektra coating applied to item # 46020-K only. 3 Flute Design provides an extra-smooth finish. These tools have a much shorter up-cut section than the standard compression tools. They are ideal for mortising grooving and dado. Special unique carbide grade increased clearance geometry and razor-sharp cutting edges with polished flutes provide a superior finish and longer tool life especially in abrasive materials. Great for production settings and excellent for creating grooves and dado cuts in particleboard plywood and laminate. Primarily used on CNC machines and other automatic routers. Can be used with handheld and table-mounted portable routers.