I have this for hex shank bits. The small ones didn't fit at first, but you can loosen the holder furthest to the back and replace it with the lower attachment points. To do this, I "pry open" some space with a large screwdriver. Not difficult, not screwed up, now all my hexes fit. Well, except for 2, because between the 4 smallest slots there is only room for two of them.
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