Shown in Polished Brass BAW1452 Features: Knob has 1'' square faceplate Knob has full lip strike plate Knob requires door thickness 1.375'' - 1.75'' Egg shaped knob Rose has fully concealed fasteners Rose is available in pair Rose use with pre-drilled door Certified by Underwriters Laboratories (UL) for use on fire doors up to three-hour rating U L10C / UBC 7-2 (1997) Positive Pressure Rated, UL10B Pressure Rated cUL certified Construction: Solid forged brass construction Color/Finish: Lifetime polished brass finish Polished brass finish Oil rubbed bronze finish Venetian bronze finish Satin nickel finish Polished chrome finish Dimensions: Knob fits standard 2.125'' door prep Overall Full Dummy Knob Dimensions: 2.5'' H x 2.5'' W x 2.485'' D Optional Rose Dimensions: 2.625'' H x 2.625'' W Optional Insert Dimensions: 5.4'' H x 4.5'' W x 0.1'' D