For residential single and multi-family bed/bathroom doors. Pushbutton locking, opens from outside with small tool, turning inside knob releases pushbutton. 1-Piece knob for increased security. Solid brass trim and all metal parts. 3-Piece assembly. Fits all doors, 2-3/4 in or 2-3/8 in backset, 1-1/8 in square corner, 1/4 in round corner or circular drive in preps.