Use this rail and stile router bit set to create beautiful door frames for glass panel, flat panel and raised panel doors. Rockler rail and stile bit sets are manufactured to exacting standards and create perfectly matched cope and stick joints. The one-piece design of these bits allows you to achieve a perfect fit without having to disassemble an arbor and install shims. The ball bearing guide allows you to use a template to build doors with curving rails. Features: K10 and K20 grade carbide for clean cutting action. Precision balanced for smooth operation. Baked-on anti-stick coating to reduce pitch and resin buildup.