A. Materials This adjustable door spring hinge is made of carbon steel with a black epoxy coating on the surface. The springs are durable and corrosion-resistant. They are suitable for outdoor environments and can withstand bad weather and daily wear and tear. B. Adjustable Tension This automatic door closing spring can adjust the spring tension according to the size of the door. It is suitable for use on light to heavy doors, making daily life more convenient. C. Design Features The two sides of the door spring hinge are lengthened, which makes the door bear force more evenly during the automatic closing process, thus extending its service life. D. Suitable for Multiple Scenarios You can use this 14 - inch door spring for gates, garden fences, agricultural fences, household doors, and various wooden doors. It can be used for the automatic closing of both left - opening and right - opening doors. E. Quantity and Dimensions The product includes 1 14 - inch door spring hinge, 2 locating pins (0.86 inches long), 4 screws, and 1 adjustment pin (2.86 inches long). The product dimensions are suitable for most doors or fences. F. Easy Installation The door spring is installed on the hinge side of the door, the fence frame, or the hinge. The package contains all the fixing devices and accessories, so there is no need to buy additional screws for the garden door hinge. G. Packaging List 1. Metal door spring × 1 2. Installation screws × 4 3. Locating pins × 2 4. Tension adjustment tool × 1 H. Specification Parameters 1. Material: Carbon steel 2. Color: Black 3. Total length: 35.6 cm/14 inches 4. Weight: 490 grams