Design Combines Two Small Wings That Cut Downward To Shear The Top Edge For A Splinter Free Surface, And Two Large Wings That Shear Upward For A Smooth Finish. Produces Raised Panels For Doors And Paneling. Use 1/2" Height For 5/8" Stock. Use 5/8" Height For 3/4" Stock. Cuts All Composite Materials, Plywood, Hardwood, And Soft Wood. Use On Table Mounted Portable Routers.