Klein Tools 31872 4-Piece Carbide Hole Cutter Set Description: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.This 4-piece Carbide-Tipped Hole Cutter kit cuts quick, precise holes in a variety of materials. Features:Set contains: 7/8-Inch, 1-1/8-Inch, 1-3/8-Inch plus one extra pilot bit Integrated flange prevents the operator from drilling beyond the sheet metal Conduit and pipe sizes: 1/2-Inch (13 mm) to 1-Inch (25 mm)Hole Saws cuts quick precise holes in stainless steel, mild steel, iron, copper and brass sheet up to 3/16-Inch (5 mm) thick Split point pilot drill bit prevents bit walking