Versatile Applications: Fit for school, gym, and locker. Sturdy and Rust Resistant: a solid brass body and a hardened steel shackle made the lock harder to cut, pry, or saw. Non-corrosive inner components protect the lock against corrosion. Secure Build: the lock is double-bolted, which ensures it stay locks in case one side of the shackle is broken through. Precision pin tumbler cylinder ensures smooth operations, security, and longevity. Easy to Use: the lock comes with 2 keys, and is self-locking, so you can lock without having a key. These keys are key different.