Fein Slugger Nova HSS Annular Cutter – 2 9 16" Diameter 3" Cutting Depth 3 4" Weldon Shank CNC Machined Steel Bit for Magnetic Drill Presses Air Compressors and liquid spills with 39 and liquid spills with 39 CFM suction airflow 1 mm) Braking Mechanism Integrated Fast Stop Electronic Motor Brake Work Area Illumination High Lumen Integrated LED Cut Line Light Base Adjustment Type Tool Free Vertical Slide Depth Guide Pro Tip: Set the adjustable footplate so the guide point bit flute extends only 1 8 inch past the rear surface of your gypsum board Engineered for professionals who demand speed this cutter removes only the perimeter of the hole