Hammer drill series bosch gbh bosch professional power 850 watt gear 1 speed tool holder sds plus weight 29 kg idle speed max 900 rpm blow count max 4 000 countsmin drill diameter in steel 13 mm drill diameter in wood 30 mm special features speed pre selection rightleft rotation overload protection stepless speed control anti vibration power supply mains operation impact force 32 joule operating voltage 230 v number of gears 1