* Door opening and closing is easier and quieter. *Material: These automatic door closer hinges are made of heavy duty steel that is highly rust and corrosion resistant. *Doors will close automatically: No more forgetting to close the doors in your home. Includes hex key, tie rod and matching mounting screws for quick and easy installation. *For Exterior or Interior Doors: Designed to be mounted on any left or right hand operated door. *Fire Protection: Positive pressure fire tests listed. *Meet the Everyday: Our black covered cabinet hinges can meet the daily needs of large families. * Which can be tightly installed on doors and can also be used for cabinets, doors and windows, cabinets, tool boxes, etc., Manufacturer: JINGYAN