The M series was designed and manufactured using the same superior standards that have made Ingersoll Rand a proven leader in the door hardware industry series ANSI mortise locks meet the highest quality certifications and exceed the requirement of American and Chinese national hardware standards. The M series cylinders can be integrated into the same 4 level master keying system that includes the E SERIES Euro mortise,and R series cylindrical locksets by ingersoll Rand.M series commercial locksets fit many applications, including airports, factories, office buildings, schools and hospitals,When long lasting, dependable and secure products are a priority, rely on Ingersoll Rand M series.