The Bosch RHH181-01 18-Volt Lithium-Ion 3/4 in. SDS-plus Rotary Hammer features innovative CORE brushless technology also delivering an unbeatable combination of power and weight. 2. Currently if you purchase RHH181-01 you will receive an additional Free Bosch High Capacity 18-Volt Lithium-Ion Fat Pack Battery (BAT619G) (Online Only). The Core package delivers tools that are engineered to perform smarter, harder, and faster. Core tools utilize improved batteries, integrated on-board electronics, and new Bosch EC brushless motor technology providing up to 65-percent longer run time and 30-percent more power. The new Rotary Hammer can drill more than 150 holes (1/4 in. x 1-1/2 in.) in concrete with one battery change (4.0 Ah). This Hammer Features a 3-Mode Selector rotation only, Rotary Hammer, and now with chisel only.