Cordless hammer drill series bosch gbh bosch professional gear 1 speed tool holder sds plus weight 208 kg idle speed max 890 rpm blow count max 4 350 countsmin drill diameter in concrete 26 mm drill diameter in steel 13 mm drill diameter in wood 30 mm special features rightleft rotation brushless motor electronic speed control power supply battery operation battery voltage 18 v battery capacity 6 ah number of batteries mit 2 akkus technolog