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, #45902, diameter (D) 3/16, radius (r) 3/32, cutting height (B) 1/2, shank (D) 1/4, overall length (L) 1-3/4, flutes 2, solid carbide (brazed to steel shank) core box 3/32 radius x 3/16 dia x 1/2 x 1/4 inch shank