Heavy-duty circle cutter produces precision circles in sheet metal, brass, copper, soft steel, aluminum, plastic, wood and composition materials. The HSS cutting blade adjusts to accommodate the thickness of your material and features a replaceable cutting blade and a replaceable 1/4 in pilot drill. This adjustable cutting tool will make holes or wheels from 1 to 6 in (25 mm to 152 mm) in diameter. The 3/8 in round shank circle cutter works like an adjustable hole saw but is designed for a drill press. Its maximum safe speed is 500 rpm. All adjustments are made with a hex wrench which is included. Ideal tool for making clock faces, toy wheels, birdhouses and other projects - Great for woodworkers, model builders, hobbyists and clock makers. Replacement blade is General Tools model # 4/5 blade, replacement drill is General Tools model # 5/6/55 drill.