One Size Fits All Adjustable Hole Cutter, Make Holes In Drywall & Ceiling Tile, Cutting Diameters Range From 2" To 7" With 1/4" Increments, Utilizes A Quick Lok Arbor For Tool Free Adjust Ability, As Well As Laser Etched Markings & Size Indicator, Users Can Quickly & Easily Identify & Change Sizes Without The Use Of A Hex Key, Durable & Reusable Debris Shield With Spring Collar Keeps Cutting Blades Level & Work Areas Clean, For Applications In Drywall & Ceiling Tiles Including Recessed Lights, Audio Speakers, Fire/Security Systems & Clearance Holes, Includes Clear Plastic Shield.