Also sometimes called "knucks" or "knuckle dusters" or "punch rings", and a similar weapon the "tekko" is one of the traditional weapons of kobudo, a martial art from Okinawa, Japan. Knock Him Out! Brass knuckles add an extreme wallop to your punch.
The finger knife is used both as a weapon and as a cutting instrument among the Turkana. It consists of a knife blade or “miniature knife”, fashioned into a finger ring at the base. The finger hole is referred to as akeju (literally “foot”) and the sickle shaped blade is called ekababait.