This TSA Lock features a 3/4" steel shackle and an all metal design. It has an easy-to-use 3-pin tumbler and works with all Bulldog locking zippers. This TSA Lock with Steel Shackle is TSA-accepted and Travel Sentry Approved. (Using a Travel Sentry Approved lock allows your luggage to be unlocked and inspected by security authorities without cutting off or breaking open causing damage.)Using these Travel Sentry Approved locks allows your luggage to be unlocked and inspected by security authorities without damage. Features: TSA accepted travel lock Travel Sentry approved Easy to use combination