These easy-to-use sets combine the two-piece stile and rail cutter set with a large diameter horizontal panel-raising bit. Use only in a 1/2″ shank table-mounted 2-1/2 HP or greater router. The panel raiser must be run at 10,000 RPM’s or less. The sets with undercutter produce a true 1/4″ tongue while cutting the panel profile. Carbide tipped.