ND75PD: Classroom Security LockCATALOG ND75PD Classroom Security Lock Key in either lever locks or unlocks outside lever. Inside lever is always unlocked. Inside lever is always free for immediate egress. Available Styles: RHO Available Finishes: 626 Standard Features Certification: Exceeds ANSI A156. 2, Series 4000, Grade 1, UL Listed for 3 hour fire door. Meets A117. I Features: Tested to exceed three million cycles Latch: 1 1 8 x 2 1 4, Square corner faceplate, 1 housing