This is adapter tray to fit 2.5" SSDs into a 3.5" HDD mount. There are four versions of this model; two that fit 3x 7mm high SSD and two that will fit 2x 8mm+ SSDs. For each mount there's a full sized 3.5" tray and a "stubby" tray that's only 101mm long, for cases where you're going to mount using the front four mounting screws only.
The author marked this model as their own original creation. Imported from Thingiverse.