It is a 2" Latch Hanger

These are the standard

This wire is used on commercial galvanized chain link

creates a large surface area to bare against the post to prevent the hinge from spinning

Encrypted DIP Single-Button Remote Control 60CommercialGalvanizedChainLink It is a 2" LatchEncrypted DIP Single Button Remote Control Performance Ideal for applications such as gated communities or commercial applications requiring a large number of remotes for a common entrance Dual 12 position DIP programming offers up to 4,096 codes Narrow band transmission on 3 simultaneous frequencies (310, 315, 390 MHz) Compatible only with Security+ 2. 0 commercial receivers and operators Safety and Security Encrypted DIP style single button remote