The essential feature of a doorknob is that it facilitates the opening and closing of doors. Doorknobs can be classified according to the purpose of the usage. Some doorknobs are decorative while others are functional. Others are used as a security measure. It is also possible to match a utility oriented doorknob with good looks. Cabinet doorknobs are usually used as decorative handles that are commonly seen in homes and office cabinets.

There are four basic types of doorknobs: dummy knobs, entrance doorknobs, passage doorknobs, and privacy doorknobs. Passage doorknobs are also known as closet knobs or hall knobs, which are generally placed where a lock is not essential. Privacy doorknobs are normally used for bathrooms and bedrooms. These doorknobs can be locked and do not have a cylinder, which needs to be keyed. In many cases, a generic unlocking tool is also provided for conveniences. Dummy doorknobs are fixed knobs; they an excellent solution for closet doors. Many times a latch is also not required. These doorknobs are mostly used on the inactive doors, which are a set of double doors.

Based on design, doorknobs can be further classified as acorn, emtek, fusion, and heritage hardware. Others include schlage, skipping stone studio, and weiser lock. Acorn as the name suggests is a knob can be made out of materials such as stainless steal. Acorns are made out of rough iron or smooth iron. Some doorknobs are made out of wood, brass, silver, aluminum, or copper.

The crystal knob is another type of doorknob that may be traditional or contemporary but is usually quite expensive. Delamain frosted crystal ball doorknobs are available on polished brass, polished chrome, or satin chrome back rose.

Porcelain knobs and reproduction doorknob sets are also very popular but need a lot of care and maintenance.

Many dealers provide their customers high quality doorknobs and knob sets. Most hardware stores offer secure and functional doorknobs, as well as a selection of decorative doorknobs. Different types of doorknobs can also be ordered online.

Door Knobs provides detailed information on Door Knobs, Glass Door Knobs, Door Knob Hangers, Antique Door Knobs and more. Door Knobs is affiliated with Dog Doors.

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