For hall and closet, all interior doors where a simple latch is all that is required. Rounded design to proportionally fit the palm of the hand. Both knobs always free; no locking mechanism. DOOR PREP: 2-1/8" Cross Bore, 1" Edge Bore, 1" x 2-1/4" Latch Face. BACKSET: 2-3/8" standard and adjustable to 2-3/8" or 2-3/4" optional. DOOR THICKNESS: 1-3/8" to 1-3/4". CYLINDER: 5-pin. FACEPLATE: 1" x 2-1/4" round corner. STRIKE: 2-1/4" full lip round corner. BOLT: 1/2" throw. HANDING: Reversible for right or left hand doors. ANSI/BHMA: Grade 3.