General description This Automatic Hydraulic Door Closer is designed for both commercial and residential use, accommodating doors weighing between 25-45kg. It features an adjustable spring mechanism and an enclosed buffer for smooth operation. The door closer allows for a door opening range from 90° to 180°, enabling it to hold the door open at any angle without the need for external force or a door stopper. Ideal for maintaining ventilation or facilitating the movement of goods, this door closer automatically closes the door silently when pulled to 90°. Technical specifications Material: High-quality aluminum alloy Weight capacity: 25-45kg Door width compatibility: 750-850mm Closing speed control: Two independent valves for customizable closing speed Installation Comes with detailed installation instructions and an installation video for easy setup. Designed for smooth and straightforward installation. Usage Suitable for right and left opening doors, including wooden and metal doors.