Over All Dia. 3 9/16”, Carbide Height 1”, Large Radius 1/2”, Small Radius 1/4”, Bore Dia. 1 1/4”.With this cutter, you get two cutters in one. One part is a 1/4" rounding over cutter and the other is a 1/2" rounding over cutter. It can also be used to create new molding profiles and as a beading cutter.