Holds up to 20 end mills, up to 6mm (1/4 inch) diameter and about 60mm in length.
That covers virtually all end mills up to that diameter.

I use this tray for the endmills currently in use and keep new ones in the endmill holder you can find in my uploads.

If I was to do it again, I'd have them rest at a steeper angle, as it is, you either want to gently open and close the drawer or put the tray in perpendicular to the drawer.