Rugged Carbon Steel Material Self-closing door springs are made of high-quality metal with a black protective coating, and three layers of protective coating prevent or reduce element damage to ensure extra protection so you can use it with confidence. The sturdy construction makes it durable, making it ideal for outdoor gates Adjustable Spring Tension Self-closing door springs are designed to store force and use it to automatically close your door. You can adjust the spring tension to control the speed of closing the door according to your actual needs, suitable for heavy and light operation, simplifying your daily life. Self Closing Gate Door Spring This automatic door closing device helps keep your property safe by always closing the door after use. The automatic closing of the gate ensures that unattended children or pets cannot leave your care without parental permission, an essential good tool if you have children or pets. Easy Installation This heavy duty door spring is very easy to install, fasten the spring door closer on one side to the door with the screws provided, screw the other side to the post, adjust the spring tension with the adjusting pin, and finally secure the spring with the locating pin. Can be used for left and right door opening. Gate Return Spring Set Product includes 1 14" black spring door closer, 2 locating pins (0.87" long) and 1 adjusting pin (2.36" long) and 4 screws (1.18" high), the right size for your daily use . The matching installation accessories make your installation more convenient.