For residential single and multi-family entrance doors. Unlocked by key from outside when outer knob is locked by turnbutton on inside knob; Emergency Exit feature, no unlocking required for panic exit, inside knob always unlocked. 1 piece knob for bettersecurity and appearance. 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 for easy installation. All locksets have the same finish for both interior and exterior parts. DOOR PREP: 2-1/8 in Crossbore; 7/8 in or 1 in Edge Bore; 1 in x 2-1/4 in Latch Face, 1/2 in throw standard. DOOR THICKNESS: 1-3/8 in to 1-3/4 in CYLINDER: 5-pin tumbler C keyway with nickel silver keys (2).