Produces Many Different Styles Of Fluted Millwork Or Use To Cut Decorative Designs In Cabinet Door. Ideal Bit For Making Signs. Cuts All Composition Materials, Plywood, Hard Wood And Soft Wood. Use On CNC And Other Automatic Routers As Well As Hand Held And Table Mounted Portable Routers. No. 18-106: 3/16" Large Radius. No. 18-108: 1/4" Large Radius.