Bosch GBH 12-52 D SDS-Max Rotary Hammer Drill in Carry Case The most powerful rotary hammer from Bosch! FEATURES Top performance when drilling and chiseling thanks to the 1,700W motor and 19 Joules of single impact energy Exceptional durability thanks to robust metal components Automatic lock-on switch for highest user comfort during continuous chiseling applications Restart protection prevents autonomous restart of the tool after power blackout. Only through new, conscious activation will the tool be ready to use Rotation control clutch protects the user and the machine in case of overload or binding. No abrupt blockage of the tool by unlatching clutch dogs and minimizing torque Speed selection dial allows best work results with speed pre-selection for applications requiring material-specific speed Optimal power transmission via SDS-Max toolholder for large hammers Constant speed gives best work results thanks to electronic regulation of speed - even under load Soft start for clean drilling starts Service display indicates an impending carbon brush change SPECIFICATION Rated Power Input: 1,700 W Impact Energy: 19 J Rated Speed: 0 - 220 rpm Impact Rate at Rated Speed: 1,750 – 2,150 bpm Weight: 11.5 kg Length: 600 mm Width: 120 mm Height: 312 mm Toolholder: SDS-Max Drilling Dia. (Concrete, Hammer Drill Bits): 12 - 52 mm Opt. Appl. Range (Concrete, Hammer Drill Bits): 30 - 50 mm Drilling Dia. (Concrete, Breakthrough Drill Bits): 80 mm Drilling Dia. (Concrete, Core Cutters): 150 mm NOISE & VIBRATION Hammer Drilling in Concrete:  Vibration Emission Value ah: 20 m/s² Uncertainty K: 1.5 m/s² Chiselling:  Vibration Emission Value ah: 15 m/s² Uncertainty K: 2.8 m/s²