... 600gr/m2 w-beam highway crash barriers 30000 tons guardrails per year ISO9001 cert. guardrailsSpecification(general): 4318X312X82X3 mm ... and Z post, etc.Accessories: spacer, blockout, separator, terminal ends, connector, bolt & washer etc.Surface treatment: Hot dip ... check the quality.Certificate: ISO9000:2001 guardrails (highway guard rails,w-beam guardrails, safety barriers, crash barriers, steel ...