<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2011) (Learn how and when to remove this template message) </Td> </Tr> <P> The bow drill is a prehistoric form of drilling tool . It commonly was used to make friction fire, and in this function it also was called a fire drill . However, the same principle also was used widely in drilling for purposes of woodworking and dentistry . </P> <P> Bow drills were used in Mehrgarh between the 4th and 5th millennium BC . This bow drill--used to drill holes into lapis lazuli and carnelian--was made of green jasper . Similar drills were found in other parts of the Indus Valley Civilization and Iran one millennium later . </P> <P> The bow drill consists of a bearing block or handhold, a spindle or drill, a hearth or fireboard, and a simple bow . Other early versions of mechanical drills include the pump drill and the hand drill . </P>

When was the bow drill fire making kit invented
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