High-quality materials: the spring-loaded door closer is made of high-quality, durable carbon steel with plastic coating, smooth and burr-free, rust-proof and deformation-resistant, suitable for indoor and outdoor use. The robust steel with black powder coating guarantees a long service life. [Automatic Close] This bar door closer uses an automatic door closure design with spring, which automatically restores the closed state by the spring. There is no need to close the door after entering the door, and can effectively reduce the force when closing the door and the door from damage. Adjustable spring tension: the automatic door closer has an adjustable design where you can freely adjust the closing force with the included adjustment lever, which increases comfort and smoothness when closing the door. Easy to install: adjustable door closer springs are very easy to install. The door closer is simply mounted and tightened between the door frame and can be used both left and right. When mounted in the middle, you can also operate both doors at the same time to save costs. Wide range of applications: spring-loaded door closers are suitable for wooden doors, plastic doors, fences, etc. Can be used for left and right opening doors.Strong stress: 356mm total length for heavy doors, adjustable tension can also be used for light and heavy doors. Colour:Black Material:carbon steel Size:36x4cm Package Contents: 1 set * Hinge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.