The Steelco CM-7 Combination Padlock is a simple 3-digit round combination lock | 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 | 3-digit combination padlock functionality | Pre-set 3-digit lock code | 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