The gimlet bit is an extremely old structure. The bit is the same style as that Employed in the gimlet, a self-contained Software for boring compact holes in Wooden by hand. Because about 1850, gimlets have experienced a range of cutter types, but some remain developed with the initial Variation. https://drillbitmanufacturer38383.tinyblogging.com/the-definitive-guide-to-drill-bit-77981678