Cordless drill impact driver cordless drill driver series bosch gsb bosch professional battery voltage 144 v battery capacity 15 ah number of batteries with 2 batteries type of battery li ion battery management replaceable battery gear 2 speed tool holder keyless idle speed max 1 600 rpm blow count max 24 000 countsmin max drehmoment hart 53 nm weight 16 kg integrated torch drill diameter in concrete 13 mm drill diameter in steel 13 mm d