EXCELLENT QUALITY --- The door spring is made of high-quality carbon steel, and the triple protective coating provides additional protection. The design is exquisite, safe and reliable, sturdy and durable, and has a long service life. EASY TO USE AND INSTALL --- The door spring is exquisite in design, convenient and quick to install, equipped with installation accessories; easy to use, the spring automatically closes the door and gate, and the tension is adjustable. HEAVY-DUTY DOOR SPRING --- The door spring can be used for heavy-duty doors, and the adjustable tension design is also suitable for light and heavy-duty doors. Durable steel with black powder coating can provide long-lasting service life. SCOPE OF APPLICATION --- The door spring is suitable for courtyard gates, fence gates, wooden boxes and villa gates. GUARANTEE --- We promise that if you have any problems, we will solve them. Because we are proud of the customer service we provide!, Manufacturer: Jenngaoo