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 fits the Wera Kraftform 817 R extending screwdriver handle (PN 05051482001), and a handful of your most used bits and bit inserts.