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Brass knuckles, also sometimes called knuckles, knucks, brass knucks, knucklebusters, knuckledusters, an English punch or a classic, are weapons used in hand-to-hand combat. Brass knuckles are pieces of metal shaped to fit around the knuckles. Despite their name, they are often made from other metals, plastics or carbon fibers. Designed to preserve and concentrate a punch's force by directing it toward a harder and smaller contact area, they result in increased tissue disruption, including an increased likelihood of fracturing the victim's bones on impact. The extended and rounded palm grip also spreads across the attacker's palm the counter-force that would otherwise be absorbed primarily by the attacker's fingers, reducing the likelihood of damage to the attacker's fingers.
History and variations
Metal ring and knuckle style weapons date back to ancient times and have been used all over the world for many hundreds of years. The Nihang Sikhs used an early variant called Sher Panja in the 18th century. Cast iron, brass, lead, and wood knuckles were made in the United States during the American Civil War (1861–1865). Soldiers would often buy cast iron or brass knuckles. If they could not buy them, they would carve their own from wood, or cast them at camp by melting lead bullets and using a mold in the dirt.
Some brass knuckles have rounded rings, which increase the impact of blows from moderate to severe damage. Other instruments (not generally considered to be "brass knuckles" or "metal knuckles" per se) may have spikes, sharp points and cutting edges. These devices come in many variations and are called by a variety of names, including "knuckle knives."
By the late 19th century, knuckledusters were incorporated into various kinds of pistols such as the Apache revolver used by criminals in France in the late 19th to early 20th centuries. During World War I the US Army issued two different knuckle knives, the US model 1917 and US model 1918 Mark I trench knives. Knuckles and knuckle knives were also being made in England at the time and purchased privately by British soldiers. By World War II, knuckles and knuckle knives were quite popular with both American and British soldiers. The Model 1918 trench knives were reissued to American paratroopers. British Commandos even had their very own "Death's Head" knuckle knife, featuring a skull-shaped brass knuckle handle.
Legality and distribution
Brass knuckles are illegal in Hong Kong, Austria, Belgium, Canada, Bosnia, Croatia, Cyprus, Finland, Germany, Greece, Hungary, Israel, the Republic of Ireland, Malaysia, the Netherlands, Norway, Poland, Portugal, Russia ("кастет", from French "casse-tête", which means "head-breaker"), Spain, Turkey, Singapore, Taiwan,  and the United Kingdom.
Import of knuckle dusters into Australia is illegal unless a government permit is obtained; permits are only available for limited purposes, such as police and government use, or use in film productions. They are prohibited weapons in the state of New South Wales.
In Brazil, brass knuckles are legal and freely sold. They are called "Soco Inglês," which means "English Punch."
In Canada, brass knuckles, or any similar devices, are listed as prohibited weapons; possession of such weapon is a criminal offence under the Criminal Code. Plastic knuckles have been determined to be legal in Canada. Similar legislation has been instituted in Russia and Australia.
In France, brass knuckles have been illegal for twenty years. They can be bought as a "collectable" (provided one is over 18), but it is forbidden to carry or use one, whatever the circumstance, self-defense included. The French term is "poing américain", which literally means "American fist".
In Sweden, brass knuckles are legal to purchase and own (for people over 18 years old), but are not legal to sell or carry in public. The carrying of brass knuckles carry the same penalty as carrying a knife, and falls under the same law. They are called "knogjärn", literally "knuckle iron".
In Taiwan, according to the Law of Taiwan, possession and sales of brass knuckles are illegal. Under regulation, brass knuckles are considered weapons. Without the permission of the central regulatory agency, it is against the law to manufacture, sell, transport, transfer, rent, or have them in collection or on display. 
In the United States, brass knuckles are not significantly regulated at the federal level, but various state, county and city laws prohibit their purchase and/or possession. Some state laws require purchasers to be 18 or older. Most states have statutes regulating the carrying of weapons, and many specifically prohibit brass knuckles or "metal knuckles." Where they are legal, brass knuckles can normally be purchased online or at flea markets, swap meets, and at some sword and weapon shops. Some companies manufacture belt buckles or novelty paper weights that function as brass knuckles and are sold "for entertainment purposes only". Brass knuckles made of hardened plastic, rather than metal, have been marketed as "undetectable by airport metal detectors." A number of states that ban brass knuckles also ban plastic knuckles. New York's criminal law statutes list both "metal knuckles" and "plastic knuckles" as prohibited weapons but provide no definition for either.
|Wikimedia Commons has media related to Brass knuckles.|
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