... lawn fence 1.rustless,high strength, maintenance free 2. four-layer surface protection, easy to install. 3.ISO9001:2000. steel ... : hot-dip galvanized steel Our products are protected by four-layer surface coating treatment as follow:1) hot-dip galvanizing2) ... 5. high strength steel structure, good impact resistance.6. four-layer preservative treatment, more than ten years service life.7. maintenance ...