I've run machine shops for the last 30 years. For 99% of metric sizes, you can buy a number, letter or fractional size for a whole lot less. There are a few sizes that aren't within a few thousandths, but most below 1/2" can be found in standard sizes for a lot less money, if you can deal with the drill diameter being .002~.003 off. In reality, if it needs to be closer, it should be reamed anyway.
Just trying to save you a buck or two...
Terry