Hooray! Service TSA Lock - 4 Digit Combination Lock For Travel Safety and Security Environmentally Friendly Luggage Lock-2 Pack(Black and Silver) Lock Without Fear of Having Locks Cut Open. Be assured of Your Travel. 4-digit locks offer More Combinations Set and take Long Time to crack than 3-digit locks. Can Easily Set or Reset a Personal Combination Code Recognized by the TSA (Transportation Security Administration). TSA Agents Never Leave Your Bags Unlocked After Inspections, Because They Cannot Remove The Key Without Relocking It. So You Can Keep Belongings Safe After TSA inspection!