door floor spring, floor hinge 1) 500,000 times open/close tests. 2)Capacity weight100- 150kg. 3)for double swing door door floor spring ... , mab floor hinge, spring closer, door closer, ground hinge,ground spingiron ... can be PSS & SSS.can match MAB, DORMA&NEW STAR pivot.very popular design in middle-east market.very good spring ...