Drills are available standardized drill little bit sizes. An extensive drill bit and tap dimension chart lists metric and imperial sized drills together with the expected screw tap dimensions. There's also specified specialized drill bits that can build holes with a non-round cross-segment.[1] Heart drill bits, figures 1 to six https://laneshujx.worldblogged.com/40357249/indicators-on-drill-bit-you-should-know