A 6 ft (1.8 m) bō is sometimes called a rokushakubō (六尺棒: ろくしゃくぼう). This name derives from the Japanese words roku (六: ろく), meaning "six"; shaku (尺: しゃく); and bō. Shaku is a Japanese measurement equivalent to 30.3 centimeters (0.994 ft). Thus, rokushakubō refers to a staff about 6-shaku (1.82 m; 5.96 feet) long. This thickness allows the user to make a tight fist around it in order to block and counter an attack. Source:
http://en.wikipedia.org/ Hanbōjutsu, the art of wielding the hanbō, is a focus in several martial arts including the Kukishin-ryū koryū classical school of martial arts, and Kukishinden-ryū, one of the nine schools of Bujinkan Budo Taijutsu. Part of the importance in using this length is that it is approximately that of a walking cane. Although techniques with a cane in this ryū-ha utilize pulling or hooking and possess one rounded end, that they invariably function the same as a hanbō in all other respects.The hanbō can be used as a means of striking, restraining or even throwing someone. It is useful to know because sticks are abundant and can be picked up if attacked. Masaaki Hatsumi says that one who wishes to be a swordsman should first master hanbō techniques, since it can be held and utilized in a similar fashion to a Japanese sword (but without the cutting edge). When utilized properly (parrying by deflecting the sword by striking the flat parts of the blade), it was more than capable of defeating a katana. Source:
http://en.wikipedia.org/ 
