1、SAFE AND RELIABLE Self closing door spring, safe and reliable, designed to ensure that the door can be automatically closed every time you enter and exit. 2、GOOD TENSION This self closing gate spring can adjust the spring tension, suitable for heavy and light doors, and has a long service life. 3、CARBON STEEL MATERIALS Selected high quality carbon steel materials, high hardness, durability and wear resistance, not easy to damage or deform. 4、BLACK SURFACE TREATMENT The black surface treatment is used to prevent rust, provide additional anti corrosion protection, firm and stable. 5、EASY INSTALLATION The automatic closing door spring kit contains installation screws and accessories for easy installation and use. 1 x Spring4 x Screw3 x Accessory Item Type: Gate Door SpringMaterial: Carbon SteelWeight: Approx. 530g / 18.7ozTotal Length: Approx. 36cm / 14.2inSpring Length: Approx. 25cm / 9.8inScope of Application: Home door, farm fence, garden fence or other doors