Made with the quality Kwikset is known for, all these door knobs are backed by a lifetime mechanical warranty. They come in a wide array of styles, so you'll be sure to find just what you're looking for. They are available as half dummy knobs, passage door knobs, privacy bathroom knobs, and as door knobs with keys so you can find a knob for almost any application. Easy to install, Kwikset Door Knobs fit most standard doors.