[rondinol]

Have you considered a second drill bit set and a drill bit sharpener? They may seem unnecessary but with drill bits many students tend to break them and leave them laying around. Leave one out and one kind of hidden away for that moment when you need that one size bit.

Furthermore with many tools being used bits tend to get dull and there becomes a collective pile of dull drill bits which tends not to be to fun to deal with.

These aren't necessarily but useful none the less.