A knuckle duster is a piece of metal that is designed to be worn on the back of a person's hand as a self defense weapon, so that if someone try to mess with them they can protect themselves by using a knuckle duster.
A knuckle duster is a piece of metal that is designed to be worn on the back of a person's hand as a self defense weapon, so that if someone try to mess with them they can protect themselves by using a knuckle duster.