CORE BOX 3/8 RADIUS 1/4 SHKCut half-round grooves for fluted moldings, columns, millwork and signs using a core box bit. Used with an edge guide, it can cut coves. Can be used with handheld, table-mounted and CNC routers. Perfect for making flutes on CNC machines. Perfect for juice groove in cutting boards. Excellent for cutting: High Density Urethane (HDU Board); Laminate; MDF; Softwood/Hardwood; and Veneered Plywood.