The gimlet bit is a very aged layout. The bit is the same model as that Employed in the gimlet, a self-contained tool for tedious smaller holes in Wooden by hand. Because about 1850, gimlets have had a variety of cutter models, but some remain developed with the original version. https://drill-bit-manufacturer17407.blogs100.com/34791142/the-basic-principles-of-drill-bit-supplier