Designed to fit a 3/8” drill, the carbide coated self-sharpening blades will quickly and easily cut holes in drywall and ceiling tiles. You can cut holes from 2.5 to 7” diameter adjustable in 1/2” increments. This is ideal for recessed lighting, circular in-wall speakers or any application that requires a clean-cut hole. A dust shield is included to keep the dust and debris to a minimum.