Large Air Drill, Reversible Roll Throttle, 725 RPM, 1.75HP, Stub Taper, Threaded Chuck. We have several series of large drills to meet your construction and industrial needs. The 22 Series works best for general applications up to ⅞ inch (22mm) holes, while the 33, 44, and 551 Series are better suited for opening and closing large valves, or for drilling larger holes between 1 inch (25mm) and 3 inches (76mm).Side Exhaust: All the Ingersoll Rand large drills come with side exhaust to keep exhaust air pointed away from you and away from your work. Governed Motor: No matter which Ingersoll rand large drill series you’re interested in, you can expect a governed motor that regulates air intake to keep these drills working at the peak of their power curve. Lightweight: The 22 Series of large drills is strong but lightweight for increased ease of use. Balling bearing support for long life and efficient operation