Dewalt 8.5-Amp Corded Rotary Hammer Drill Rotary hammer kit is a light weight, low vibration, high-performance drill designed for demands of todays contractor. The durable German engineered mechanism delivers 3.0 joules of impact energy that delivers up to 15% faster speed of application that professionals demand. The active vibration control technology employed delivers reduced user vibration for less user fatigue and greater productivity. Perfect for drilling into concrete. Can also chip concrete for small projects.