While the rosettes in most homes are simple metal pieces they can be elegantly detailed and some door handles particularly those with vintage designs do not have a rosette at all.
Door handle pieces names.
While not the most important of door knob parts a rosette is the plate behind the door handle or lever.
Door handle parts names.
The bolting mechanism has a spindle that retracts from the door frame when one of the handles is twisted allowing the door to open.
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The bolting mechanism is the metal piece that extends from the center of the doorknob into the door frame s latch hole to keep the door closed.