... to the client's inquiry highway guardrail (crash barriers, safety barriers, road barriers)highway guardrails:normal specification : 4320 ... USA, AS/NZS, ETC.Post : I beam post, H beam post, Sigma post,Z post, post, Tubular Post and Cylinder post, etc.Accessories: Connector, ... request, samples abailable for you to check the quality.Certificate: ISO9000:2001 and ISO14001:2001. highway guardrail