Rotary Hammer with SDS-max Bosch GBH 11 DE Professional Powerful combi hammer for rapid drilling and chiselling. 1. Best drilling performance thanks to optimised hammer mechanism technology and high- performance motor 2. Low-vibration hammer mechanism for fatigue-free working 3. Long lifetime due to use of high-quality materials and components made of fibreglass reinforced plastic, aluminium and precision parts made of steel