Hydraulic plunger: 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. It also reduces noise disturbance when the door closes, minimizing damage to the door caused by a 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 support illustrated 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 use: This automatic spring holder is suitable for most doors. The automatic door closer is suitable for metal doors, security doors, wooden doors, etc. The adjustable automatic closing door is an ideal choice for homes, offices, and hotel rooms. 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, left and right doors can be installed. You can use the included adjustment rod to insert it into the rotating hole and adjust the closing force to increase the convenience of door closing. Specification: Product Name: Automatic Door Closer Material: Zinc Alloy Color: Black