The Porter-Cable 43247PC is a 3 Wing Slot Cutter Router Bit. The saw blade style action provides a smooth cut and delivers effective chip removal. A common use for slotting cutters is the installation of T-moldings, weather stripping and tongued wood edgings. Slotting cutter is also used to join wood by cutting slots for reinforcing splines. Three-wing slotting cutter is a very efficient and easy way to cut a groove of a specific width in the edge of a work piece.