High quality - The hydraulic carrier farm is made of high quality aluminum alloy. It can close your door automatically and silently. Will improve your quality of life. You no longer have to shout 'Close the door' almost as much.Adjustable speed - The door farm has 2 valves that independently control the closing and locking speed. You control the closing speed at your leisure.Easy to install and standard quality - The door farm comes with a detailed and clear installation manual and a video installation. It will be a simple and fluid installation.Widely applicable - The door-to-door spring size 3 is used for a door weight of 40 to 65 kg and a door width from 830 to 950 mm. The automatic closing is suitable for the right and left door, wood, to the metal door, at the residential and commercial door, at the exterior / interior door farm, at the fire door, at the hotel, the condominium , at the apartment complex and the warehouse.If the door and door frame are not on the same plane and more than 5 cm. You need a parallel plate to install on the doorIf you need a parallel plate we will send it to youPerfect for parents who have naughty children Love the doors.Prevent animals from pushing the door and leave without knowing it.Damage protection.Stop the noise doors that slam.