Abstract: A router bit that includes an arbor having a shank portion, a shaft portion and a collar section intermediate the shank portion and shaft portion. The router bit also includes at least one lower cutter having a body portion and at least two cutter blades and at least one upper cutter having a body portion and at least two cutter blades. Disposed between and defining a distance between the at least one lower cutter and the at least one upper cutter is at least one spacing element. The distance between the at least one lower cutter and the at least one upper cutter is adjustable by varying the number of spacing elements.