The gimlet little bit is a really old structure. The bit is similar design as that Utilized in the gimlet, a self-contained Resource for dull little holes in wood by hand. Considering that about 1850, gimlets have experienced several different cutter layouts, but some remain created with the original Variation. https://drillbit14826.theblogfairy.com/33443457/the-definitive-guide-to-drill-bit