Cordless drill impact driver series bosch gsb bosch robustseries bosch professional battery voltage 18 v battery capacity 4 ah type of battery li ion tool holder keyless idle speed max 1 850 rpm blow count max 27 500 countsmin max drehmoment hart 85 nm weight 25 kg charge indicator integrated torch drill diameter in concrete 16 mm drill diameter in steel 13 mm drill diameter in wood 45 mm chuck width 1 5 13 mm torque levels 25 1 max