Empire Level 27993 Circle Cutter, Heavy Duty, 8 Inch, 7/8-Inch to 8-Inch Diameter Used to cut circles in wood, soft metal and plastic Replaceable steel cutting bit Replaceable 11/64-Inch pilot drill bit plus 1/4-Inch round shank Adjustable circle sizes 7/8-Inch - 8-Inch Hex key included, use with drill press or bit brace