Bosch GBH 2-28 DV 110V Professional Rotary Hammer

The most powerful tool in its class
Rated power input 850W 
Max. impact energy 3, 2 j
Drilling diameter in concrete with hammer drill bits 4 – 28 mm
Highest drilling rate and highest chiselling performance in its class 
25% longer lifetime than other rotary hammers in its class for more efficiency
27% less vibration than the predecessor model due to active vibration damping
Rotation stop for chiselling
Ball grommet for preventing cable breaks
Rotating brush plate for equal power in forward and reverse rotation
Overload clutch to protect the user and the machine
Forward/reverse rotation for dislodging jammed drill bits
Continuously variable speed control for clean drilling starts