Champion XL200STK-3/4-Inch RotoBrute 3/4-Inch Cobalt Stack Cut Annular Cutter, 2-Inch Depth RotoBrute Cobalt Stack Cut Annular Cutters are made to cut cleanly through several layers of steel and positive slug ejection. Recommended for materials with a brinell harness number up to 275. Cut clean, bur free holes Cuts cast iron, steel and ultra hard or exotic alloys