Brass knuckles are a weapon that is illegal in many states. FindLaw discusses laws pertaining to brass knuckles.
The Law Around Brass Knuckles, Concealed Weapon
How to Make Brass Knuckles: 13 Steps - wikiHow
Is It Legal to Fight Back if Someone Hits You? - FindLaw
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Why are brass knuckles illegal even though knives are more dangerous and deadly? - Quora
Brass Knuckle Laws in the United States
Brass Knuckle Laws in the United States
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Brass knuckles, clubs, keychains: New law in Texas expands limits of open carry
When are you legally within your rights to point a weapon at someone in Missouri? - Quora
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If I were beaten with brass knuckles in Alabama, can I sue civil for medical bills? - Quora
Are brass knuckles illegal in California? - Quora
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WHY ARE BRASS KNUCKLES ILLEGAL WORLDWIDE