Compliant with ADA Standards, the Master Lock No. 1651MKADA Built-In Combination Lock series is designed for single point horizontal latch lockers and features three ways to open with a student key, master key and combination for use like other combination locks in your system. These locks are designed for special needs students without looking different. As the ADA version for the 1652 series, these locks have five different pre-set combinations for a longer, useful life in your facility.