The most common drills that I use are the sizes from 1mm to 10mm at .5 increments. From 1 to 5mm I have more than one of those sizes as they are the most common sizes that will break. I have some that are under 1mm mostly .4 and .7 but they tens to break if care is not used.
For drilling I use a drill press for the drills from 1 to 10 mm for the under 1mm I use a pin vice drill….
