I had about 12ft of this stuff, extruded aluminium rectangular section which has been sat gathering dust for years so thought it might as well be used for something. I machined some rectangluar plugs for the ends which were an interference fit, hammered them in with a touch of Loctite 238 which allowed me to thread screws into the end. Cutters are sorted by shank size, then by type (4-flute, slot-drill, ball-nose etc), then by size. I have a load more small 6mm-shank solid carbide mills which are a bit too short for this rack so I'm still puzzling over how to store them.
I'm trying to avoid pondering on the dozen odd drill sets I have lying around! But I have just bought this cobalt HSS metric set so have yet another to find a hole for. These puppies go through anything.
Chris