HIGH QUALITY: The hydraulic door closer is made of high-quality, sturdy aluminum alloy, which is durable, rust-proof, and has a long service life. ADJUSTABLE SPEED: You can control the closing speed as you like. It also reduces noise interference when the door is closed, reducing damage to the door caused by violent impact. EASY TO INSTALL: You can use the included adjustment lever to insert it into the pivot hole and adjust the desired closing force. Includes screws and brackets shown in the picture. HYDRAULIC BUFFER: 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. WIDELY USED: 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.