Commercial Leverset (Grade 1), Cal-Royal ICGN03-US26D (Brushed Chrome), classroom function supplied with 2 keys, includes 2-3/4 commercial backset. Lock function description (Classroom): Dead locking latch bolt operated by lever from either side except when outside lever is locked from outside by key. When outside lever is locked, latch bolt is operated by turning inside lever. Inside lever always unlocked. Outside lever can be set in locked, or unlocked position only by key.