This set of two perfectly matched cutter router bits eliminates the hassle of disassembling reversible-type stile and rail cutters when switching from one cut to the other. Designed for use with 23/32" to 7/8" thick hardwoods or softwoods. Use in a router table mounted router only! Shims included. Note the cutters shown are for RS5-9261 Quarter Round design. The perfect complement to CMT raised panel cutters makes it fast and easy to build your own cabinet doors.