Speare Tools Adjustable Speaker-Cutter Hole Saw, AB 1610: * Cuts round holes from 6 1/4" - 10 3/8" in drywall and ceiling tile with no mess when using the clear, flexible dust shield * Fits a 3/8" and 1/2" drill chuck * May be used with cordless drills * Self-sharpening carbide-coated cutting blades for long life * Drill not included