Hammer drill drilling capacities concretesteelwood 261330 mm blows per minute 4000 bpm impact energy 2 8 j series bosch pbh power 750 watt gear variable speed tool holder sds plus weight 33 kg idle speed max 3 000 rpm blow count max 4 000 countsmin drill diameter in concrete 26 mm drill diameter in steel 13 mm drill diameter in wood 30 mm special feature rotation stop power supply mains operation impact force 28 joule operating vo