This will hold Wiha impact bit holder (used for 1/4" bits). It will hold other bit holders too, including most Dewalt bit holders.

Superglue 6mm (diameter) x 2mm (height) neodynium magnets to hold the bit holders in place.

There are spots for magnets on the bottomside, such that the tray will stay fixed in metal toolboxes.

Amazon link:

• https://www.amazon.com/gp/product/B01GLQJYNK