These bolt seals are designed as a one-time use product which means once the seal has been locked it must be removed by destroying the seal. Each bolt seal features a unique laser engraved serial number on both the bolt shaft and the locking mechanism. The Bolt Seal feature an anti-spin feature which provides added security to prevent un-authorized entry and tamper evidence. These bolt seals also feature a unique metal-on-metal interlocking mechanism for added cargo security.