Blue Boar TCT Metal Pro 2-3/16" (56mm) tungsten carbide hole cutter. Up to 3/16" thick stainless steel, sheet metal, cast iron, aluminum, copper, brass, steel plate, fiberglass, FRP. Cutting depth up to 3/16 with integral safety collar to prevent over drilling Multiple precision ground tungsten carbide teeth for long life and fast cutting Cuts steel plate, stainless steel, cast iron, aluminum, copper, brass, fiberglass, hard composites Includes 7/16" arbor or use standard 5/8-18 hole saw arbors extension, and quick release adapters