This 4-piece carbide tipped hole cutter kit cuts quick, precise holes in a variety of materials. Set includes three commonly used sizes plus an extra pilot bit. Integrated flange prevents the operator from drilling beyond the sheet metal. Split point pilot drill bit prevents bit walking. Hole saws cuts quick precise holes in stainless steel, mild steel, iron, copper and brass sheet up to 3/16 in THK Split point pilot drill bit prevents bit walking Integrated flange prevents the operator from drilling beyond the sheet metal All components are packed in a rust-proof, molded plastic carrying case