Premium-quality micrograin carbide tips are ground on specialized CNC equipment for an extra-fine finish with maximum sharpness and edge retention. The rail bit is used for doing ogee profile rail cuts for cabinet doors. Fully hardened and tempered steel shank provides enhanced durability. Adjustable set produces tight fitting joints for cabinet door frames. Reversible assembly that can also be used to make stile cut, by order on the arbor. Super sharp cutting edges and close tolerances ensure tight gap-free joints. Micrograin carbide tips provide superior wear resistance and long life. For use with a router table only. Used for doing all varieties of frame-and-panel assemblies for furniture and architectural applications.