An additional tip for future readers...

For the numbered drills, put a spot of white paint every five drills, then red paint every ten drills. Makes it easy to count to the correct drill without squinting at the numbers. Sharpie paint markers are handy for this sort of color coding of tools.

Can you believe that we Usonians are still struggling with three idiotic drill nomenclatures...

Letters - no indication of size, nomenclature closed at both ends
Numbered - no indication of size, counterintuitive numbering (drills get smaller as numbers increase), closed at one end
Fraction - how many people can mentally calculate the drill one size smaller than 19/64 ?

The drill nomenclature alone should be a decisive argument for adopting, at minimum, metric nomenclature for everything.