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, #45904, diameter (D) 1/4, radius (r) 1/8, cutting height (B) 1/4, shank (D) 1/4, overall length (L) 1-5/8, flutes 2, Carbide Tipped core box 1/8 radius x 1/4 dia x 1/4 x 1/4 inch shank