Champion Cutting Tool CT5-1-3/16 Carbide Tipped Hole Cutter: Up to 3/16" depth of cut Superior to Bi-Metal Holesaws! Faster and More Accurate Drilling! Longer Tool Life! For use in an electric drill: Ideal for drilling steel plate, stainless steel, iron, aluminum, copper, cast iron, fiberglass and plastics up to 3/16" inch thick Unique Triple Edge Cutting System for fast, bur free/smooth drilling! Ejector spring ejects slug saving time and safety collar stop prevents over penetration for safer, faster operation Common applications include drilling: junction/switch boxes, metal studs, appliances, auto body repair, truck/trailer frames, ductile pipe