Cordless drill driver series bosch professional bosch gsr battery voltage 18 v battery capacity 4 ah type of battery li ion battery management replaceable battery gear 2 speed tool holder keyless idle speed max 1 300 rpm max drehmoment hart 31 nm weight 19 kg charge indicator integrated torch drill diameter in concrete 13 mm drill diameter in steel 13 mm drill diameter in wood 38 mm charging time 45 min chuck width 1 5 13 mm torque level