Material: Chrome aluminum alloy steel.Taille: about 7 * 6.5 * 1.6 inches. Suitable for doors on the left or right, suitable for a door weight 35 kg, door width 100 cm, maximum opening angle of the 175 door. The closing force of our door farm can be adjusted with a key attached hexagonal, tighter or more loose depending on your personal needs. This internal door farm can work well with many types of doors. It is suitable for installation on the wooden door frame or aluminum alloy in the house, the office, the hotel, the apartment, the dorm, etc. The package contains 1 door farm, 5 screws and 1 hex wrench. The corresponding metal screws for easy installation and hex key to adjust the force. Specifications Material: Aluminum alloy Size: 7 * 6.5 * 1.6 inches Maximum opening angle of the door: 175 Weight of the door: 35 kg Width of the door: 100cm Package included: 1 automatic door farm 5 screw 1 support < P> Application scope This product is suitable at home, hotel room doors, in the office, inside, wooden doors, using alloy door. 'Aluminum. How to install 1. Find the 2 adjustment bolt. Remove the bolt from the hole 3. Use a key to adjust the 4 bolt. Fixing the bolt After completing the setting to children under 3 years old. Please read the waist forward correctly. Buy.