Passage knob locksets security - polo boxed round corner latch and strike polished brass finish. 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 inch cross bore, 1 inch edge bore, 1 inch x 2-1/4 inch latch face. Backset: 2-3/8 inch standard and adjustable to 2-3/8 inch or 2-3/4 inch optional. Door thickness: 1-3/8 inch to 1-3/4 inch. Cylinder: 5-pin. Faceplate: 1 inch x 2-1/4 inch round corner. Strike: 2-1/4 inch full lip round corner. Bolt: 1/2 inch throw. Handing: Reversible for right or left hand doors. Ansi/bhma: Grade 3. Features Microban Antimicrobial Technology.