Brass knuckles are known as deadly street weapons. Keep in mind they become deadly if you don’t use them properly. So, be careful while using them.
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Can a brass knuckle with the thickness of 0.5cm do some damage, or in order to do damage you need a 1cm thickness one? - Quora
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Why are brass knuckles so dangerous? - Quora
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What damage can a brass knuckle punch produce? - Quora