Four Fluted Cutter For Routing Tenons With A Clean Finish On The Shoulder.Tungsten Carbide Tipped For Use On Timber And Abrasive Man-Made Boards.Cutter Has Four Cutting Edges With Two Down-Shear Blades For The Shoulder And Two Up-Shear For The Face Of The Tenon.Ideal For Tenoning Or Where A Large Area Needs To Be Recessed Or Surfaced.Improved Finish On Interlocking Grain.PTDTREDIR3712X12TC