The Jonard Tools AHC-10 adjustable hole cutter is designed for cutting round holes in ceilings, walls, and floors and is the perfect tool for installing recessed speakers, lighting, or other round objects. Perfect tool for cutting (2.2" to 10") holes in drywall, acoustical tiles, and plywood for the installation of recessed lighting, in-wall round speakers, and other items. The dual adjustable blades make cutting into these materials fast and easy. The heavy duty and rugged polycarbonate dust shield catches all the debris making cleanup a breeze. This dust shield also includes a rubber gasket for better sealing against flat surfaces and easy cleaning. The compression spring used with this assembly absorbs vibrations while cutting which helps reduce fatigue.