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commercial door knobs cylindrical door lock Item no.:588 color :CP Keyed Entry Knobset Features : 2-1/8" bore 2-3/8" or 2-3/4" backset Sq. corner strike & latch 5year. mechanical manufacturer warranty ANSI grade 2 Any color is avaiable You can choose 3 types: 1) Keyed knob which is operated by key outside,thumbturn inside. (ET) 2) Privacy knob which is operated by an emergency key outside,thumbturn inside. (BK) 3) Passage knob lock -This passage lockset is ideal for a closet or hall door where privacy is not important. (PS) Rose Dia:64mm cylindrical door lock knob door lock ET,BK,PS function