Our Electronic LockerSection Features the Master Lock No. 3681 & No. 3685 Electronic Locker Padlocks. These Built-In Locker Locks Display Clear Identification of Locker Vacancy and Provide Interactive Feedback. The Master Lock Electronic Locks, Which Features an Enhanced Electromechanical Deadbolt, Are Suitable for Most Locker Doors Made of Metal, Wood or Phenolic.