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, #45901, diameter (D) 3/8, radius (r) 3/16, cutting Height (B) 1/2, shank (D) 1/4, overall length (L) 2, flutes 2, Carbide Tipped core box 3/16 radius x 3/8 dia x 1/2 x 1/4 inch Shank