Master Electricians Hole Cutter Kit 8-Piece Klein Tools 31873 Cuts quick, precise holes in stainless steel, mild steel, iron, copper and brass sheet up to 3/16-Inch (5 mm) thick Set contains: 7/8-Inch, 1-1/8-Inch, 1-3/8-Inch, 1-3/4-Inch, 2-Inch, 2-1/2-Inch, two extra pilot bits Split point pilot drill bit prevents bit walking Integrated flange prevents the operator from drilling beyond the sheet metal Conduit and pipe sizes: 1/2-Inch (13 mm) to 2-Inch (51 mm)