Bits Will Produce Super Cuts On Both Surfaces Of The Rabbet. Can Be Used In Joining Boards Or For Letting In Back Panels. Cuts All Composition Materials, Plywood, Hard Wood And Soft Wood. Used On Hand Held And Table Mounted Portable Routers. Comes With Interchangeable Bearings To Cut The Following Depths: 1/8 ",1/4", 5/16", 3/8", 7/16" And 1/2".