1.Surface treatment:Hot dipped/Electro galvanized,Electrostatic spraying 

2.Material:three types:round pipe,square pipe oval pipe

3.Advantage:good oxidation resistance,strong,durable and flexible construction  

4.Process: 

1)galvanizing before welding or made of galvanized steel tube and then welded   

2)welding before galvanizing (only feasible for guardrail with relatively small size)

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Usage

We also could supply following types & accept customization