DEFENDER TSA approved die-cast padlocks, designed for use in airports to aid Transport Security Administration (TSA) screeners. For security reasons they may open and inspect luggage and will forcibly remove locks that are not TSA compliant. At USA airports the use is effectively compulsory if you want your luggage to remain secure. Uses a 3-wheel combination mechanism for convenience and offers 1,000 differs. Ref: UTTK4784