BONDHUS hex wrenches (Allen Keys) are a quality US made product that will last you for years. I supply them in the 3 common sizes for UNC fasteners used on tattoo machines.
These feature a long arm and ball end with a black oxide finish.
The sizes I have available are-
5/64 for set/grub screws
3/32 for button head screws usually used to fasten coils
9/64 for cap head screws usually found on armature bars, spring decks and binders.
These are available as singles or as a set of 3.