Heavy-duty 20ft concertina razor wire, also commonly called constantina wire, designed for strong perimeter security. Made from galvanized steel with sharp razor blades for effective intrusion deterrence and reliable outdoor performance. Suitable for installation on compound walls, chain-link fences, gates, warehouses, factories, farms, schools, commercial buildings and other restricted areas. The galvanized finish provides improved resistance to rust, rain and harsh weather conditions. Each roll covers approximately 20ft (6.1m) when properly expanded. Suitable for residential, commercial and industrial security projects. Retail and bulk quantities available.