The gimlet bit is an extremely previous style. The bit is similar design as that Employed in the gimlet, a self-contained Instrument for unexciting tiny holes in wood by hand. Because about 1850, gimlets have experienced a range of cutter styles, but some are still manufactured with the initial Variation. https://franciscoapdsg.spintheblog.com/34701130/an-unbiased-view-of-drill-bit