Fence Clips are used to attach signs to a substation or other chain-link fence. Unlike other attachment methods, you can now hang a sign with only one person, typically saving 10 minutes per sign for installation. Clips lock into the "repeat" of the fence and, once attached to a sign, are very difficult, if not impossible, to remove. Most signs only require two Fence Clips. To help thwart sign vandals, use one-way, tamper-proof bolts.

Also see: 
    How do I attach a substation sign?