With a stop device, it can realize the mutual conversion between positioning and non‑positioning. Application: Fire Doors, Stainless Steel Doors, Wooden Doors, etc. Adopt sliding moving track, with firm connection, smooth sliding, and convenient to installation. strong and durable, with good durability and stability. tighten screw clockwise to reduce closing speed, loosen screw counterclockwise accelerate closing speed., Manufacturer: Shun Yingtong