CD5710 series Travel Sentry Approved (TSA) 4 digit combination lock has a special identification mark alerting the TSA and other security agencies that they can open this lock without destroying it. Each lock has a special code so screeners know which tool to use to open. Set any combination of numbers, easy to set and reset with flexibility to create your own combination. Up to 10000 unique combinations. Also great for lockers, tool boxes, and gates.