Let's not get silly with drill sizes, in reality drills are not that precise, and to measure a drill to two decimal places (metric) is a bit much, after all, 0.05 mm is approx only .002" .
It all depends on the operator's skill, material, how it's been sharpened etc. etc. as to what size hole you actually end up with!
You can sharpen drills to cut different sizes - probably up to .005" bigger if you want. Holes in aluminium will vary enormously at different temperatures, and if the hole is too small you can warm it up and the magnet will probably drop in. ( epoxy to make sure).
In short, technique will be more important than the nominal drill size, - save your money I reckon!