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Takeaway: Durable all-metal locks, easy to change the combination, smooth rolling tumblers. You'll receive a pair of identical TSA007 combination padlocks and an instruction sheet. The lock is solidly made from an all-metal housing and shackle and weighs about 2 ounces. The standard tumbler allows the TSA to open it with a special key to inspect your luggage without cutting/breaking non-compliant locks off. I've made the switch to TSA locks as the last time I was using an older suitcase with a built-in zipper lock, and they literally cut the zippers off my bag (even though they didn't have to) rendering it useless for future travel. Not only did I have to get a new suitcase, but I made sure to get these compliant locks to go with it.
The initial combination code for the locks ‘0000.' The numbers each roll smoothly and gently 'click' into place. To change it, pull on the shackle to open it, turn it 90 degrees towards you and press down until it clicks. Then just turn the tumblers until your desired code is lined up on the side with the little arrow and re-lock the shackle. These locks are light duty but enough to keep the zippers on your bag from opening, preventing easy access theft. However, note that these probably won't hold up to a bolt cutter or a hammer if your entire bag gets stolen.