Sturdy & Durable: Self closing gate springs are made of premium carbon steel with black powder coated anti-corrosion, anti-rust; It designed for long-term outdoor use Installation Instructions: The end with the “TOP” sticker must face upward. This end should be installed on the gate, and the other end should be installed on the doorpost Tension Adjustable: can be adjusted by changing the tightness of the hexagonal nut (clockwise tightening, counterclockwise loosening) to adjust the closing speed of the spring-loaded door closer Note: hexagonal nut can only be screwed to the end of the word “TOP TIGHTEN”, screwed to the appropriate position, you need to put the toggle up immediately) Install Direction: Install the product in the direction of the door opening. If the door is pulled inward, the spring is installed inside the door; if the door is pushed outward, the spring is installed outside the door Self Closing: The self closing gate spring designed to close gates and doors automatically, which can liberate your hands and provide convenience Wide Application: The gate springs are mainly for self-closing doors and gates, such as wood fence, vinyl door, square wood post or whatever you think is appropriate,etc