Kunai

Two variations are the short kunai (shō-kunai) and the big kunai (dai-kunai). It is a good example of a very basic tool which, in the hands of a martial arts expert, could be used as a multi-functional weapon.

The kunai is conventionally wrought of ranged from 20 cm to 60 cm, with the average at 40 cm. The kunai is used by common folk as multi-purpose gardening tools and by workers of stone and masonry. It is not a knife, but something more akin to a crowbar. The blade is soft iron and unsharpened because the edges are used to smash plaster and wood, to dig holes and to pry. Normally only the tip is sharpened. The uses to which a kunai is put would destroy any heat-treated and sharpened tool like a knife.

Kunai normally have a leaf-shaped blade and a handle with a ring on the pommel for attaching a rope. This allows the kunai's handle to be wrapped to act as a grip, or when used as a weapon; to be strapped to a stick as an expedient spear, to be tied to the body for concealment, or to use as an anchor or piton.

http://en.wikipedia.org/wiki/Kunai

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