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What is the name of the iron ring that holds the flag of the lamppost?

The iron ring for fixing the light pole flag is called stainless steel throat belt. Stainless steel hose is a round stainless steel metal, which is mainly used for lampposts, fire hydrants and other objects. Light pole flag advertisement is a kind of advertising media located on city street lamps. Because it looks like a flag hanging on a lamppost, it is also named road flag advertisement.