This tsa lock features a 3/4" steel shackle and an all metal design.It has an easy-to-use 3-pin tumbler and works with all bulldog locking zippers.This tsa lock with steel shackle is tsa-accepted and travel sentry approved.(using a travel sentry approved lock allows your luggage to be unlocked and inspected by security authorities without cutting off or breaking open causing damage)Model Fit: UniversalType: Combination LockModel Or Style: TSAColor: BlackSize: .75" ShackleMaterial: SteelMount: ZippersBattery: N/AVolt: N/AFunction: Lock