This heavy duty lock has a 'No-Rust Protection' guarantee which assures that the lock body will be free of rust for the life of the product. Moisture seals and a covered keyway add protection against harsh weather conditions. The dual armour construction features a laminated steel core with a weather-resistant cover that protects against extreme dirt and grime. It has ball bearing locking for maximum pry resistence and exceeds professional grade standards for trucks, trailers, sheds, garages, gates, storage units, and other applications. Includes one key that works with all 3 locks.