A hiuchigane, or hiuchigama, is a Japanese fire starting kit. Steel, a fire-stone, usually meno (agate) or sekiei (quartz), and hokuchi (tinder) are used to start fires easily. It would aid the shinobi when preforming Katon No Jutsu.
Natori Masatake mentions in the Shoninki shinobi manual a fire starting implement called an uchitake or tsuketake. According to Natori, the tool could be used for arson, a ground burning skill called jiyaki for warmth when sleeping, among other things.