TSA Quatro Travel Sentry: This lock is made from tough brass with a 4 dial lock, allowing for up to 10,000 combinations. The lock will not only keep undesirables out when you travel, but the TSA (Transportation Security Administration) system also allows US customs to examine luggage safely and easily, without damaging your lock or bag to examine the contents.
Instructions: Spin the shank around 180 degrees from the opening position and depress. Keep the shank depressed in this position and move the dials to your desired personal combination code. Then lift the shank and turn it back 180 degrees to the original position and depress. To lock the padlock move the dials on to any different numbers, the shank should then be secured in place. To open the padlock simply move the dials back to your chosen personal combination code and the shank will be released.