The Mighty Seven Air Die Grinder, No. QA-211, offers a high-powered motor rated at 0.9hp that helps to reduce stalling and has an operating rpm speed of 20,000. Other notable features include a self-locking throttle trigger, OSHA safety rated 76dBA working sound pressure, and a rubber grip that reduces users fatigue from vibration. The kit includes a 1/4”, 1/8” collets, and two wrenches for quick and easy bit change out. The tool is backed by a three-year warranty.