Champion CT5-1-15/16 Tungsten Carbide Tipped 1-15/16-Inch Hole Cutter 3/16-Inch Thin Metal Special tungsten carbide teeth with one piece construction Removeable ejector spring, replaceable pilot pin and comes with safety collar stop with a maximum cutting depth of 3/16" Cuts steel plate, iron, aluminum, copper, cast iron, stainless steel, fiberglass and PVC and Conduit plastics Applications include: junction/switch boxes, metal studs, electrical appliances, lighting fixtures, auto and truck body repair and cast iron pipes