45911 Carbide Tipped Core Box 1/8 Radius x 1/4 Dia x 3/8 x 1/2 Inch Shank

Cut 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
Veneered Plywood