Description heritage brass broadway door latch mortice knobs on back plate product has a round bun shaped knob on an art deco back plate door knobs are half sprung only one side is sprung polished chrome bright finish on a solid brass base material polished chrome is a plated smooth and mirrored finish screw on face fix flat back plate with blank for latch use only fire rated for use on 30 and 60 minute fire class doors dimensions knob diameter 60mm projection 60mm back plate length 156