Pull tight Galvanized Steel cable seals offer a tamper evident solution for sealing truck trailers, containers, and various other cargo holds. Made of heavy-duty Galvanized Steel these cable seals have a tension strength of up to 551 lbs and come pre-printed with 6 digit sequencial numbers. To use simply thread the end of the 1.8mm Galvanized Steel wire through the heavy-duty aluminum alloy lock and pull tight. These security seals can only be removed by wire cutters. This is a ISO 17712:2013 Compliant Seal.