Cordless drill impact driver series bosch gsr bosch professional battery voltage 18 v number of batteries without batteries type of battery li ion battery management replaceable battery gear 2 speed tool holder keyless idle speed max 1 900 rpm blow count max 28 500 countsmin max drehmoment hart 60 nm max drehmoment weich 31 nm weight 12 kg charge indicator integrated torch drill diameter in concrete 13 mm drill diameter in steel 13 mm dr