For bedroom and bathroom doors. Inside lever locks/unlocks by turnbutton. Outside lever unlocks by emergency key. DOOR PREP: 2-1/8 in Cross Bore, 1 in Edge Bore, 1 in x 2-1/4 in Latch Face. BACKSET: 2-3/8 in standard, 2-3/4 in optional. DOOR THICKNESS: 1-3/8 in to 1-3/4 in FACEPLATE: 1 in x 2-1/4 in STRIKE: 2-1/4 in full lip. BOLT: 1/2 in throw. ANSI/BHMA: Grade 3.