These are 3 different Socket holders to organize some loose sockets sizes that I had on hand. I was not concerned as much on the space that it takes as the easiness to find quickly the right size. As I have already showed in the attaches picture I have used a White oil base Sharpie marker that I had on hand from marking the tires. I have used a very fine sand paper to prepare the numbers surface before applying the white marking.The locking keys are not going tight as I did not had a need for that. If you want that to be tight you can just scale up the 3D model in slicer.

I have made some corrections to the imperial socket organizer as the 5/8 socket it was to tight and I have re-spaced the locations of the socket key.