Crafted from strong, pressed steel, the Industrial Bulldog Hinge - also known as a butt hinge - is easy to install and can also be used on automated gates. Built for chain link fence systems, these helpful hinges can swivel 90 degrees in either direction and can be modified to swing a full 180 degrees using a 180° offset adapter. Most chain link gates require two bulldog hinges, while the majority of double gates necessitate four bulldog hinges.