Cordless impact drill series black decker bdchd gear variable speed tool holder keyless min idle speed 360 rpm idle speed max 1 400 rpm torque max 40 nm drill diameter in steel 10 mm drill diameter in wood 25 mm power supply battery operation battery voltage 18 v battery capacity 15 ah charging time 300 min torque levels 10 spindle hub 10 included in delivery charger 1 battery number of gears 2