The Steelco CM-8 Combination Padlock is a simple 4-digit combination lock with over 10,000 possible combinations | The perfect lock for low-security private locker use (ie. school or workplace), with keyless convenience and the option for a master key for emergency opening | 4-digit combination padlock functionality | 10,000 possible combinations | Requires a pad latch or hasp on locker unit | No batteries required | Simple to use | Perfect for private locker use | Master override key available for purchase | 1 year warranty