Weslock 00411O3O3SL20 Polished Brass Interior Door Hardware Interior Privacy Knob Set With Round Rosette. Knob Diamter: 2", Extends: 2-3/8" Rosette: 2-1/2" Adjustable Backset: 2-3/8" 2-3/4" For Standard 2-1/8" Door Prep Door Thickness: 1-3/8" 2"