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Brass Knuckle Knife: Why Do People Use It for Self-Defense?, by An N I E Abernath Y

How effective will brass knuckles with spikes attached to them be

USA Brass Knuckle Styled Belt Buckle with Prong Attachment - Chrome

Black Skull Defense Keychain - Skull Knuckles Keychains - Keychain Knuckle Duster

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Gold Knuckle Duster - Golden Belt Buckle Knuckles - Gold Color Self-Defense Dusters

The Different Types Of Brass Knuckles And Their Uses, by Jairus Nadab

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What damage can a brass knuckle punch produce? - Quora