Cordless drywall screwdriver series fein asct battery voltage 18 v battery capacity 3 ah number of batteries with 2 batteries type of battery li ion battery management replaceable battery gear 1 speed tool holder 14 inch internal hexagon idle speed max 4 000 rpm max drehmoment hart 14 nm weight 17 kg max screw diameter 4 mm special feature brushless motor included in delivery 2 batteries charger driver bit bit holder depth stop scaffold hook