An effective 4 digit code combination lock with 10,000 possible combinations, making losing keys a thing of the past. Suitable for "Private Use" applications where the lockers are allocated to a user. Multi User, "Public Use" reprogrammable, combination locks are available, please see the "Type SPU" Lock if this is required. Using the master key and the code change button, you can easily reset the code for a new user or you can easily find a forgotten code. Master override key sold separately.