HYDRAULIC DAMPING: Which can open the door smoothly without scratching the facade. You have an automatic door closer that effectively prevents you from forgetting to close the door. Adjustable Speed: You control the closing speed as you wish. Also reduces noise interference when the door closes, reducing damage to the door caused by violent impact. EASY TO INSTALL: You can use the included adjustment lever to insert it into the swivel hole and adjust the desired closing force. Includes screws and brackets as shown in the picture. HIGH QUALITY: The hydraulic door closer is made of high-quality robust aluminum alloy, which is durable, rust-proof and has a long service life. WIDE APPLICATIONS: This spring-loaded automatic door closer is suitable for most doors. The automatic door closer is suitable for metal doors, security doors, wooden doors, etc. The adjustable self-closing door is an ideal choice for home, office and hotel room doors. This interior door closer is easy to install, just install and screw it between the door frames. This automatic door closer is easy to install, both left and right doors can be installed. You can use the included adjustment rod to insert the rotating hole and adjust the closing force as needed to increase the convenience of closing the door. Specification: Product Name: Automatic Door Closer Material: Zinc Alloy Color: Black.