Adjustable Hole Saw, Quickly & Smoothly Cuts Cleaner Holes In Drywall & Ceiling Tiles, Blades Adjust To Cut Holes From 2" To 7" Diameter, Fits Most 3/8" & 1/2" Drill Chucks, No Binding While Cutting, No Additional Tools Needed To Adjust The Hole Saw, Includes 2 Each Newly Redesigned Dust Shield For Longer Life & Hex Key.