Master Key Combination Lock gives you the convenience of a keyless combination lock, but allows you to disengage the lock with the matching key set and the ability to re-learn your combination using the included code finder pin. The 4-digit design enables up to 10,000 possible combination codes. A hardened steel head, 7-pin lock head/tail pin and 6.5? coated, galvanized steel cable ensure superior strength and deter tampering. Carry this lightweight, portable and compact security solution anywhere your job takes you.