Hydraulic buffer: opens the door smoothly without scratching the front. You have an automatic door closer that effectively prevents you from forgetting to close the door. Adjustable speed: you can control the closing speed as needed. It can also reduce noise interference when the door is closed and reduce damage to the door caused by strong impact. Easy to install: you can use the included adjustment rod to insert it into the pivot hole and adjust the required closing force. Includes screws and brackets as shown in the picture. High quality: The hydraulic door closer is made of high-quality and sturdy aluminum alloy, which is durable, rust-proof and has a long service life. Widely used: This automatic spring door closer is suitable for most doors. The automatic door closer is suitable for metal doors, security doors, wooden doors, etc. The self-closing adjustable door is an ideal choice for home, office and hotel room doors.