The Klein Tools 31872 Hole Cutter Kit cuts quick, precise holes in a variety of materials. This set includes three commonly used sizes and an extra pilot bit. An integrated flange prevents the operator from drilling beyond the sheet metal. A split point pilot drill bit prevents bit walking. Hole Cutters cut precise holes in stainless steel, mild steel, iron, copper, and brass sheet up to 3/16 in. thick. Users are also provided with 1/2 in. to 1 in. conduit and pipe sizes. All components are packed in a rust-proof, molded plastic carrying case. Users are provided with 7/8 in., 1-1/8 in., and 1-3/8 in. hole cutter sizes.