This is the core set of tools that tighten, loosen, or adjust things on your printer.
1.5 mm, 2.0 mm, 2.5 mm fits most of the screws.
1.5 mm, 2.0 mm, 2.5 mm fits most of the screws.
These are normally made available as part of the Owner's Kit (which is highly recommended for purchase with your first printer).