Since then, the Schlage Lock Company has consistently delivered innovation and continuous improvement.
In that tradition, The ND Series Cylindrical Lockset is a proven, easy to install product with extensive function, keying, trim and finish capabilities that work in nearly any application. The ND Series has been certified Grade 1; exceeding 3-million operating cycles without failure.Walter Schlage invented the cylindrical lock in 1920. ND Series Lever Locks The Schlage ND Series Locksets are commonly used in Healthcare, Education, Government, Office, Retail, and other commercial applications.