For HDD cases 126x76x13mm.
They are sold under many brands, my ones are called “U25B”
The set contains the 7 cases model (on the photo) as well as single-case model that you can use to combine your own holder for as many HDDs as you need.
Spacing between them should be 17mm.
The are models with cut-outs (for single-HDD cases) and without (for multiples).
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The author marked this model as their own original creation.