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, #45912, diameter (D) 1/2, radius (r) 1/4, cutting height (B) 3/8, shank (D) 1/2, overall length (L) 2-1/8, flutes 2, Carbide Tipped core box 1/4 radius x 1/2 dia x 3/8 x 1/2 inch shank