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, #45905, diameter (D) 5/16, radius (r) 5/32, cutting Height (B) 3/4, shank (D) 1/2, overall length (L) 2-5/8, flutes 2, Carbide Tipped core box 5/32 radius x 5/16 dia x 3/4 x 1/2 inch Shank