The Bosch Rotary Hammer packs 6.5 ft./lbs. EPTA of impact energy and features a strong 13 Amp motor for impressive power. with the vibration reduction system in the hammer mechanism, as well as the grip area, you get comfort for extended periods of work. with the hammer's 1-handed, tool-free SDS-MAX system, you can change bits with ease and still achieve maximum job site productivity. Commonly used with AMS Hollowstem Auger Kit.