A kunai (?? kunai) is a Japanese tool thought to be originally derived from the masonry trowel. The two widely recognized kinds are the short kunai (??? sho-kunai) and the big kunai (??? dai-kunai). Although a basic tool the kunai in the hands of a martial arts expert could be used as a multi-functional weapon. The kunai is commonly associated with the ninja who in folklore use them to climb walls.. A Kunai normally had a leaf-shaped wrought blade in lengths ranging from 20 and 30 cm (7.9 and 11.8 in) and a handle with a ring on the pommel for attaching a rope. The attached rope allowed the kunai's handle to be wrapped to function as a grip or to be strapped to a stick as a makeshift spear; to be tied to the body for concealment; to be used as an anchor or piton and sometimes to be used as the Chinese rope dart. Contrary to popular belief kunai were not designed to be used primarily as throwing weapons. Instead kunai were primarily tools and when used as weapons were stabbing and thrusting implements.