For use on exterior mobile home doors where key locking is desired. Turnbutton from interior or key from exterior will lock or unlock both bell-shaped knobs. 7/8 in Edge Bore. DOOR PREP: 2-1/8 in Crossbore; 1 in x 2-1/4 in Latch Face. BACKSET: 2-3/8 in standard and adjustable 2-3/8 in and 2-3/4 in optional. DOOR THICKNESS: 1-1/8 in to 1-1/2 in doors. CYLINDER: 5-pin. FACEPLATES: 1 in x 2-1/4 in STRIKES: 2-1/4 in full lip. BOLT: 1/2 in throw. HANDING: Reversible for right or left hand doors. ANSI/BHMA: Grade 3.