I am working on a series of 2 unit x 3 unit Gridfinity tool trays, to fit into my Dewalt T-Stak series tool box, as well as elsewhere. I have added a 12mm magnet hole to the center of every square for an optional countersunk screw magnet.

This one is a rack for all of the permanent markers I use, that tend to float around the workspace otherwise. You will need the following: 1x 2x3 Pen Rack Floor 2x 2x3 Marker Rack plates 4x 29mm spacers 4x 10mm spacers 4x M3x50 bolts