The material of zinc steel guardrails should be hot-dip galvanized according to the principle, and the substrate should be made of hot-dip galvanized raw materials. This material is not easy to rust and has better rust prevention ability compared to black pipes. The length of each piece of guardrail is also the distance between the columns. Normally, each column is 3 meters long. The columns can be made of brick cement columns or steel pipe columns from our guardrail manufacturer. The color can also be customized according to the size you need. The current labor cost is also a major expense. When installing finished guardrails, it will save labor, time, speed, and economy.