1/4" drive metric magnetic socket organizer
thingiverse
Holds 5-13mm 1/4 drive sockets. It works with a craftsman set and also a Harbor Freight set. 6mm x 1.5mm N52 neodymium magnets can be glued into the small slots to hold the sockets. I bought 100 of them for $10 from eBay. They are strong enough to hold the sockets in place when held upside-down, but not if shaken hard.
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