For Hall And Closets. Both Knobs Always Free; No Locking Mechanism. Features Titanium Alloy Throwbolt Core, Anti-Pick 6 Pin System And Ultra-Strike For Jamb Brace. DOOR PREP: 2-1/8" Cross Bore, 1" Edge Bore, 1" X 2-1/4" Latch Face. BACKSET: Adjustable To 2-3/8" Or 2-3/4". DOOR THICKNESS: 1-3/4" Doors Standard. 2-1/4" Doors Optional. FACEPLATE: 1" X 2-1/4". STRIKE: 2-1/4" Full Lip. BOLT: 1/2" Throw. Nickel Plated. HANDING: Reversible For Right Or Left Hand Doors. ANSI/BHMA: Grade 2.