The adjustment is according to closing speed, gate weight, and the resulting momentum generated by gate movement. The heavy gate hinges can be easily installed and used with all types of fencing including aluminum and metal fencing. Our heavy-duty hinges provide double-face fixing strength and are the safest investment you can make when it comes to hardware. If you are looking for gate hinges of heavy-duty nature, you have come to the right place. The heavy-duty hinges are made of polymer material and are reinforced by glass fiber. The heavy gate hinges are treated by UV rays and therefore have increased strength as compared to metal hinges. These heavy-duty hinges do not rust, they do not corrode, they require no lubrication, and they can survive all kinds of weather without any need for maintenance.