The gimlet bit is a very old design. The little bit is identical type as that used in the gimlet, a self-contained tool for monotonous smaller holes in wood by hand. Considering that about 1850, gimlets have experienced several different cutter styles, but some are still manufactured with the original https://drillbitmanufacturer83604.ssnblog.com/33362741/what-does-drill-bit-manufacturer-mean