General Tools 55 Heavy Duty Circle Cutter. Adjustable 1-3/4 Inch to 7-7/8 Inch

From the Manufacturer Works like an adjustable hole saw. This heavy-duty circle cutter most preferred by professionals. 1/2 round shank for drill press use. Replaceable 1/4" high-speed tool steel bit and replaceable 1/4" pilot drill. Capacity 1-3/4" to 7-7/8".