Commonly used on shipping and intermodal containers, and widely used for ground, rail & ocean transportation. 18mm pin and barrel made of high carbon alloy steel encased in ABS plastic. Features dual numbering on the pin and barrel to prevent parts substitution or replacement for greater security against tampering. Seal markings are laser engraved so the imprint cannot be easily removed or replaced. Anti-spin locking mechanism prevents tampering by spinning the pin or barrel offering superior resistance to tampering by high velocity spinning and friction attacks. C-TPAT compliant and meets or exceeds ISO 17712:2013 w/clause 6 requirements as a high security seal. Pull-apart strength of over 5000 lbs. *Must be purchased in increments of 200.