Combi hammer series bosch gbh bosch professional power 800 watt gear 1 speed tool holder sds plus weight 35 kg idle speed max 900 rpm blow count max 4 000 countsmin drill diameter in concrete 28 mm drill diameter in steel 13 mm drill diameter in wood 30 mm special features rightleft rotation electronic speed control overload protection power supply mains operation impact force 35 joule operating voltage 230 v number of gears 1