The Nova System gives you a wide range of profiling options in a single router bit with specially formulated replaceable carbide tips, which are harder, stronger and longer lasting. The replaceable blades offer better performance in abrasive material. The Nova System consists of a router bit with a ball bearing guide, designed for use with portable routers and a router bit without a ball bearing guide for surface work or profiling that can be used with portable or CNC machinery. 28 profiles are available for the Nova System. Solid carbide insert knives sold separately.