Cordless drill driver cordless drywall screwdriver series bosch professional bosch gsr battery voltage 18 v battery capacity 4 ah number of batteries with 2 batteries type of battery li ion battery management replaceable battery gear 2 speed tool holder 12 inch internal hexagon idle speed max 4 200 rpm max drehmoment hart 25 nm weight 16 kg integrated torch drill diameter in steel 10 mm drill diameter in wood 29 mm charging time 60 min chuck