MECO 28mm Holesaw Drill Bit Hole Saw Tooth HSS Steel Cutter Tool for Metal Wood Alloy Cuts Steel, Stainless Steel, Copper, Brass, Aluminum, Fiberglass, Formica And Other Laminates In Seconds Perfect for Installing Locks, Knobs in Doors and Cabinets or Drilling Larger Diameter Holes Through Desks, etc. Used for professional electric drill provides excellent performance HSS Steel, Heat Treated Make your job more convenient and easier Standard with Plastic Case(better protection) Please work safely. (Protective equipment) About 6mm Cutting Depth Please noted that if you cut the hard material such as steel, ceramic tile...you need to use the oil or water to low the temperature, if not, maybe the drill bit will be broken due to high temperature, please understand Drill Diameter Size: 28mm