Chain Link Gate Pin Hinges for Industrial applications. 180 Degree Pin Hinges mount to a gate frame and gate post. U-bolts are included and used to mount around the gate frame and post. Each hinge is adjustable to fit gate frames 1-1/2" to 2" in diameter. The U-bolt on the post mounting side is determined by the size of the post. When installing these hinges you will need a gap between the post and gate frame with a minimum of 2" inches is required, although the gap can be adjusted by pivoting the hinges. The 180 degree feature on these hinges allows for a gate to be opened in a 180 degree range of motion. Most often these hinges are used for Schools, Sport Fields, Tennis Courts, Server Rooms, and other high use and heavy duty applications.