Adding SELF-CLOSING & DAMPER features to your sliding doors. Suitable for the sliding doors up to 48" in width and 132lbs (60kgs) in weight. Door closing speed and damper force are fully adjustable. Complete system with 86" (2200mm) rail. Easy installation, no electric power required. NSC-C60V-22 is a sliding door closer/hardware sophisticated and eco-friendly SELF-CLOSING device for sliding doors, utilizing cutting-edge control mechanism with durable spring technology. Complete system with pull-spring device, damper gear, 86" (2200mm) rail, door hangers and door stopper. Simple and smart design, easy to install. Both the door closing speed and damper force are adjustable. No electric power is required, thus works even during the power outage.