They are preferred at gates and entrances requiring very high security. Completely made of steel and provide high strength. They provide full control against unauthorized access even by military vehicles such as trucks, tanks, panzers, etc. They are mounted by digging in a shallow ground. With very thick load chains they are not harmed even by collisions and continue to work. Defender barriers can be manufactured at desired height and length. They are hydraulically operated and weather resistant. They can be manufactured as painted and completely galvanized.