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, #45900, diameter (D) 1/8, radius (r) 1/16, cutting height (B) 3/8, shank (D) 1/4, overall length (L) 1-3/4, flutes 2, solid carbide (brazed to steel shank) core box 1/16 radius x 1/8 dia x 3/8 x 1/4 inch shank