For residential single and multi-family entrance doors. Unlocked or locked by keyed knob outside or turnbutton knob inside; emergency exit feature, no unlocking required for panic exit, inside knob always unlocked. 1 piece knob for increased security. Solid brass trim and all metal parts. Wrought brass exposed trim. Pressure cast zinc tubular lock housing. Key removable outside knob for easy cylinder replacement. 3 piece assembly. All locksets have the same finish for both interior and exterior parts. DOOR PREP: 2-1/8" crossbore; 7/8" or 1" edge bore; 1" x 2-1/4" latch face, 1/2" throw standard. DOOR THICKNESS: 1-3/8" to 1-3/4". CYLINDER: 5-pin tumbler C keyway with nickel silver keys (2). FACEPLATE: 1" x 2-1/4". STRIKES: Full lip, 1-5/8" x 2-1/4", 1-1/8" lip. BOLT: 7/8" housing and 1" throw. ANSI: A 156.2, 1996, Series 4000 Grade 2. DUAL OPTION UNIVERSAL: Fits all doors; 2-3/4" or 2-3/8" backset; 1-1/8" square corner, 1/4" round corner, or circular drive-in preps.