Quality Material: The self closing gate spring is made of high quality carbon steel material, which is firm and strong, not easy to break. The surface is finely polished and sprayed with paint. It has a good anti-rust and anti-corrosion function and a longer service life. Adjustable Tension: By using our supplied lock pin and regulator tool, the self-closing door spring fully adjusts the tension, providing the force required for pin locking, thereby reducing the drag of the sliding door. Therefore it can be used for light doors and heavy doors or spring doors. The self closing gate spring has active and flexible automatic door closing function, which can liberate both hands when it is installed on the door. It is your best assistant for close the door that can provide you with the greatest convenience and sense of security when you go in and out or when you are in a hurry, and take the initiative to help you close the door. Application: The self-closing gate spring can be applied to the doors of gardens, lawns, orchards, terraces, pools. Specification: The length of the entire self closing gate spring is 14" (35.6 cm), the length of the spring section is 9-4/5" (25 cm), and the screw length is 1" (2.5 cm). The package includes 1 x self closing gate spring, 4 x screws, 2 x locking pins and 1 x adjuster tool.