The SARGENT 10 Line is a heavy duty cylindrical key-in-lever handle lockset exceeding by five times the ANSI 156.2 Series 4000 Grade 1 standards. The 10G37 SARGENT lock is specifically designated withclassroom function. This indicates a rotatable outside lever which is locked and unlocked by key, and always unlocked inside lever providing aquick, no special knowledge necessary exit. At over 4 million cycles, the 10 Line beats the competitor by 30%. As for abusive force, this lock endures more than two times the standard without allowing entry. The 10 line trim is designed to conform to national and state fire and handicapped requirements.