There is evidence that during the Carthaginian invasions of Greece in c. 2200 B.C., they used metal handcuffs to restrain their Greek captives.Lutes, Jason and Bertozzi, Nick. Houdini: The Handcuff King. Hyperion, 2007. The English word "handcuff" comes from "handcop." (To "cop" means to "capture" or "get ahold of." Thus, the term "cop" for policeman.)

Styles

There are two distinct subtypes of contemporary metal handcuffs: one in which the cuffs are held together by a short chain, and another, of more recent origin, which uses a hinge for this purpose. Since the hinged handcuffs are somewhat smaller when fully extended they are seen as being more easily utilized by a police officer who has relatively small hands, and are also regarded by some observers as more secure because the wrists end up being held closer together than with the chain subtype, and are also bound more rigidly. A third type, the rigid handcuff, has a metal block or bar between the cuffs. Whilst bulkier to carry it permits several variations in cuffing and, with one hand cuffed, can be used in control and restraint techniques. Various accessories are available to improve the security or increase the rigidity of handcuffs, including boxes that fit over the chain or hinge and can themselves be locked with a padlock.

Handcuffs may be manufactured from various metals, including carbon steel, stainless steel and aluminium, or from synthetic polymers.

Sometimes two pairs of handcuffs are needed to restrain a person with an exceptionally large waistline because the hands cannot be brought close enough together; in this case, one cuff on one pair of handcuffs is handcuffed to one of the cuffs on the other pair, and then the remaining open handcuff on each pair is applied to the person's wrists. Oversized handcuffs are available from a number of manufacturers, as are juvenile-sized restraints, though none of the latter in current production are approved for use by the United States National Institute of Justice.

Double locks

Handcuffs with double locks have a lock-spring which when engaged, usually using the top of the key, stops the cuff from ratcheting tighter to prevent the subject from tightening them. Tightening could be intentional or by struggling, when tightened the handcuffs may cause nerve damage or loss of circulation. Double locks also make picking the locks more difficult.

Plasticuffs

main: PlastiCuffs Plastic restraints, known as wrist ties, plasticuffs, flexicuffs, flex-cuffs, tri-fold cuffs, or zip-strips, are lightweight, disposable plastic strips resembling electrical cable ties. They can be carried in large quantities by soldiers and police and are therefore well-suited for situations where many may be needed, such as during large-scale protests and riots. In recent years, airlines began to carry plastic handcuffs as a way to restrain disruptive passengers. Disposable restraints are considered by manyWho: date=June 2008 to be highly cost-inefficient; they cannot be loosened, and must be cut off to permit a restrained subject to be fingerprinted, or to attend to bodily functions. It is not unheard of for a single subject to receive five or more sets of disposable restraints in their first few hours in custody. Recent products have been introduced that serve to address this concern, including disposable plastic restraints that can be opened or loosened with a key; more expensive than conventional plastic restraints, they can only be used a very limited number of times, and are not as strong as conventional disposable restraints, let alone modern metal handcuffs. In addition, plastic restraints are believed by manyWho: date=June 2008 to be more likely to inflict nerve or soft-tissue damage to the wearer than metal handcuffs.Fact: date=June 2008