The Klein 31873 8-Piece Master Electrician's Hole Cutter Kit cuts quick, precise holes in stainless steel, mild steel, iron, copper and brass sheet up to 3/16-Inch (5 mm) thick. The split point pilot drill bit prevents bit walking and the integrated flange prevents the operator from drilling beyond the sheet metal. Set includes: 7/8-Inch, 1-1/8-Inch, 1-3/8-Inch, 1-3/4-Inch, 2-Inch, 2-1/2-Inch, 2 extra pilot bits. Conduit and pipe sizes: 1/2-Inch-2-Inch.