Brass knuckles, also known as knuckle dusters, are a hand-held weapon characterized by a metal frame with finger holes designed for the wearer's fingers. These formidable objects originated as a pragmatic solution to the age-old problem of hurting one's hand while punching solid objects. The invention of brass knuckles can be attributed to the realization that striking with a reinforced, metal structure not only enhanced the force of the punch but also protected the user's hand from injury. Over time, brass knuckles evolved into a controversial and often illegal self-defense tool, with a history that intertwines both practicality and notoriety.