Keep the door open at 90°~180° - When your opening angle is greater than 90°, this door closer can hold the door open at any angle. You don't need to use external force or a door stop to keep the door open. If you like a well-ventilated room or need to move goods frequently, this is your best choice. You just need to pull the door less than 90° and it will close automatically. High quality and adjustable speed - The hydraulic door closer is made of high-quality aluminum alloy. It can automatically and quietly close your door. Improve your quality of life. You no longer need to shout \"close the door \". The door closer has 2 valves that independently control the closing and latching speed. You control the closing speed as you wish. Easy to install and quality standard - The door closer comes with a detailed and clear installation manual and installation video. Simple and smooth installation. The hydraulic door closer has been approved by CE, UL, 3C certification and fire test. Manufactured according to European production standards. Wide range of applications: Size 2 door closer spring is used for doors weighing 20-40 kg and door width 750-850 mm. The automatic closer is suitable for right and left opening doors, wooden doors, metal doors, residential and commercial doors, door closers for exterior/interior doors, fire doors, hotels, condominiums, apartments, warehouses.