as a ramp to push the bolt in while the door is being closed. By the use of a latch bolt, a door can be closed without having to operate the handle. Deadbolt – Deadbolts usually extend deeper into the frame and are not automatically retractable the way latch bolts are. They are typically manipulated with a lock on the outside and either a lock or a latch on the inside. Deadbolts are generally used for security purposes on external doors in case somebody tries to kick the door in or use a tool such as a crowbar or a hammer and screwdriver etc. Strike plate – A plate with a hole in the middle made to receive a bolt. If the strike is for a latch bolt, it typically also includes a small ramped area to help the bolt move inward while the door is being closed. (Also known as just "strike") It's also available as electric strike which allows you to open the door even though the mechanical lock is locked. Dust Socket - A (nearly always) plastic socket that sits under the Strike plate concealing the rough wood of the mortise. Aldrop- A device to keep the two panels of a door in closed position. It a set of curved plates fixed on the two panels of the door. A rod then passes though the curved plates to keep the door locked. A padlock can inserted in the rod to lock the door. Accessories Numerous devices exist to serve specific purposes related to how a door should (or should not) be used. See: Door chain - A device to secure door opening Door closer – Mechanical or electromagnetic device to close an open door (in the event of a fire) Door opener - Automatic door opening device activated by motion sensors or pressure pads Door damper – A hydraulic device employed to slow the door's closure Door knocker Door stop – used to prevent the door from opening too far or striking another object Espagnolette (for a window) Fingerplate Letter box or mail slot Peephole A number of items normally accompany doors but are not necessarily mounted on the door itself, such as doorbells. See also Architectural ironmongery External links Doors Architectural elements Hardware (mechanical)