Free-Doughnut" Adjustable Circle Cutter is a heavy-duty woodworking tool designed for electric drills to bore clean holes ranging from 40mm to 200mm in diameter across materials like wood, plywood, veneer, and drywall.Key Features & ComponentsDual Cutting Blades: Features two adjustable, sharp alloy-steel blades positioned on opposite sides of the measuring bar for balanced, rapid cutting action.Included Accessories: Comes equipped with a center pilot drill bit, replaceable chisel/cutter blades, and an L-shaped hex wrench for adjustments.Shank Type: Standard 10mm straight shank designed to fit securely into standard electric drill chucks.If you need help with adjusting the blade radius or operating safely on specific materials like acrylic or plaster board, let me know!