TSA approved so the airline authorities can snip it off easily if they think you are carrying something unlawful. Happened to me.  So there goes the money. First time I ever locked my luggage and.........well, there you go.  Then I tried it on my gym locker.  Took 20 minutes to set the darn thing so that it would lock.  Hurray, I did it.  And when I went to open the locker, the lock would not open. Another 20 minutes fiddling with the numbers.  Do NOT buy if you have big fingers (and I do not have big fingers). Had to get the gym maintenance people to use wire clippers to snip it off.  Ridiculous and not worth it.