Okinawan agriculture implement, the handle used to operate a manual millstone, adopted by the Okinawas as a weapon for fighing purposes. It is used in Karate to improve technique. In recent times many United States Police Departments have issued an updated version of the tofa to their officers as a replacement for the billy clup or night stick.

Originally the handle of a grinding wheel that used as a weapon by Okinawan peasants. The tonfa is most often used as a whirling instrument, swung by its handle, but the handle itself can also be used for attack.

Crank handle for a millstone, used as a weapon by the heimin.