Cordless drill 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 12 inch internal hexagon idle speed max 1 900 rpm max drehmoment hart 60 nm max drehmoment weich 31 nm weight 18 kg charge indicator integrated torch drill diameter in concrete 13 mm drill diameter in steel 10 mm drill diameter in wood 38 mm