Allegion US announced the launch of the Schlage ALX Series ? a first in modular design for cylindrical locks. The ALX Series cylindrical, grade 2 lock is an evolution of the earlier AL Series, which was based on Walter Schlage?s first commercially sold lock, the A button lock. This first cylindrical design lock was so innovative in its time that it changed the industry, and so enduring a design that it is still offered today.