Heavy duty circle cutter/holesaw. Designed to be used with an electric drill. This unit has a 10mm (3/8") pilot drill with two adjustable sharp cutters either side that can be accurately set on the measure bars. Ideal for many kinds of materials, such as plywood, hardwood, composite, and plastic, etc. Adjustable from 25 - 120mm (1" - 4 3/4"). Hang-sell.