I built this end mill rack to fit in a shallow top drawer of my new tool box/mill stand. I made this from aluminum flat bar and a piece of angle to stamp the sizes on.
I might make an improvement by running a strip of magnetic tape at the base to keep the cutters from "walking" when opening/closing the drawer but it serves it purpose as it is for now.
To make this or similar rack, drill a series of appropriately sized holes down a length of flat bar and then cut down the middle to form the 2 rails. You get 2 mirrored parts that way.