This is a version of a kunai, is a Japanese tool thought to be originally derived from the masonry trowel. The kunai is commonly associated with the ninja, who used it to gouge holes in walls. Many popular manga characters use kunai as both their primary and secondary weapons. The sharp point of the kunai made it a perfect weapon for stabbing, and the ring on its handle helped to tie it to a pole as a spear or to a rope to use as a dart. Contrary to popular belief, the kunai was not intended to be a throwing weapon, but it could be used in this way with some effectiveness thanks to its symmetrical design and balanced center of gravity.