Like our popular Travel Sentry Four-Dial Combination Locks, these handy three-dial resettable combo locks may be opened by airport security (using secured tools) to inspect your bags, and re-locked for their onward journey. And the unique Security Window on these locks changes color from green to red if the locks have been opened out of your presence by the TSA (or anyone else!). Two locks per order. (2-1/2" tall; 5 oz/pr)