Collision guardrails are a typical cold-bent steel product.Products with excellent impact resistance, low cost, long service life, higher safety, and environmental friendliness. Railings are 310MM wide, thickness: 3MM, 4MM. One ton of railing can cover: 80 meters of 3MM thickness, 61 meters of 4MM thickness. For 1 kilometer, 3MM thick weighs 12.3 tons, 4MM thick weighs 16.388 tons.