While not legal everywhere (see below) they are designed so that the user’s punch has a more concentrated force with a smaller and harder contact point.
Brass Knuckle/Knuckle Dusters
Brass Knuckles Legality by State 2020
Climbing carabiners make impromptu knuckles, if legality of the real thing is an issue.
Sourcea for the real thing. The real thing The Real Thing 2
Brass Knuckle/Knuckle Dusters
Brass Knuckles Legality by State 2020
Climbing carabiners make impromptu knuckles, if legality of the real thing is an issue.
Sourcea for the real thing. The real thing The Real Thing 2
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