Pull Tie Steel Security Cable Wire Seals Numbered Anti-Tamper Freight Containers Seals Security Tags-Ties Metal Security Seals for Truck Trailers Cable seals allow for more versatile application, as they have variable length of the locking mechanism only by the cable length. Typical applications include sealing trucks and railway cars transporting valuable commodities. An internal locking mechanism prevents the cable from being retracted. Most cable seals are classified as security or high security level as to ISO 17712.