The Carbide Tipped Adjustable Double Bladed Hole Cutter is designed for cutting 1-3/16" to 5-1/2" holes in sheet metal, copper, brass, aluminum, plastic, wood and composition. Maximum 1-3/4" cutting depth. Supplied with hex wrench and pilot hole drill. Measurement scale is etched on cross beam to easily set hole size. Use in any drill press or drill stand. Do not use in hand held power tools.