The gimlet bit is a really outdated layout. The little bit is identical style as that Employed in the gimlet, a self-contained Software for tedious modest holes in wood by hand. Because about 1850, gimlets have had a number of cutter designs, but some remain generated with the initial Model. https://drillbit93714.bloguetechno.com/the-basic-principles-of-drill-bit-manufacturer-69410323