A is a Japanese tool thought to be originally derived from the

masonry Masonry is the building of structures from individual units, which are often laid in and bound together by mortar; the term ''masonry'' can also refer to the units themselves. The common materials of masonry construction are bricks, building ...

trowel A trowel is a small hand tool used for digging, applying, smoothing, or moving small amounts of viscous or particulate material. Common varieties include the masonry trowel, garden trowel, and float trowel. A power trowel is a much larger gas ...

. The two widely recognized variations of the kunai are short kunai (小苦無 shō-''kunai'') and the big ''kunai'' (大苦無 ''dai-kunai''). Although a basic tool, in the hands of a

martial arts Martial arts are codified systems and traditions of combat practiced for a number of reasons such as self-defense; military and law enforcement applications; combat sport, competition; physical, mental, and spiritual development; entertainment; a ...

expert, the ''kunai'' could be used as a multi-functional weapon. The ''kunai'' is commonly associated with the

ninja A or was a covert agent or mercenary in feudal Japan. The functions of a ninja included reconnaissance In military operations, reconnaissance or scouting is the exploration of an area by military forces to obtain information about enem ...

, who used it to gouge holes in walls.

Design

A ''Kunai'' normally had a leaf-shaped wrought blade in lengths ranging from 20 cm to 30 cm and a handle with a ring on the pommel for attaching a rope. The attached rope allowed the ''kunais handle to be wrapped to function as a grip, or to be strapped to a stick as a makeshift

spear A spear is a pole weapon consisting of a shaft, usually of wood, with a pointed head. The head may be simply the sharpened end of the shaft itself, as is the case with fire hardened spears, or it may be made of a more durable material fasten ...

; to be tied to the body for concealment; to be used as an anchor or

piton A piton (; also called ''pin'' or ''peg'') in climbing is a metal spike (usually steel) that is driven into a crack or seam in the climbing surface using a climbing hammer, and which acts as an anchor for protecting the climber against the ...

, and sometimes to be used as the Chinese

rope dart The rope dart or rope javelin (), is one of the flexible weapons in Chinese martial arts. Other weapons in this family include the meteor hammer, flying claws, Fei Tou flying weight, and chain whip. Although the flexible weapons share similar m ...

. Contrary to popular belief, ''kunai'' were not designed to be used primarily as throwing weapons. Instead, ''kunai'' were primarily tools and, whe