Cut a wide range of materials such as steel, cast iron, sheet metal and copper Work well with abrasive materials like high density resin and metal plates Extremely High Accuracy <0.1mm Comes in a rugged plastic box with extra pilot bit, set screw and allen wrench By using liquid coolant, it can cut over 100 holes in steel plate (~<1/4" in thickness) McJ Tools Hole Cutters offer an easy and efficient way to drill larger diameter holes without requiring large drill bits and extra-large chucks. They are manufactured from premium grade high speed steel for long lifespan. Premium HSS Hole Cutters cut a wide range of materials such as steel, cast iron, sheet metal and copper. They also work well with abrasive materials like high density resin and metal plates.