This bowl and horizontal crown bit features a radius and cutting diameter of 2-1/4" with a total cutting depth of 9/16". The shank is 1/2" in diameter Add a large concave or cove groove to your crown moldings Premium C3 micro-grain tungsten carbide blades for a sharper & longer lasting edge For use on CNC, table mount and handheld routers Silver induction brazing for maximum strength and durability