Schlage Omega Lever Classroom Function Lock

Schlage D series (commercial) classroom set with Omega style levers. Key operates outside lever to lock or unlock door.  Inside lever always open for emergency egress. Lock is prepared for BEST style (SFIC) removable core, core not included. Backset is 2 3/4. Finish is Satin Chrome (626/US26D). This is the original model, no longer manufactured.