This is a 3.5" to 2.5" hard drive (HDD) or solid state drive (SSD) spacer for the Microsoft original Xbox. It will allow you to use a smaller 2.5" drive in the 3.5" drive bay without worrying about it flopping around held in only by the electrical connections. The installation is incredibly easy and takes just a few seconds. The hard drive clips into the spacer with nubs built into the side of the spacer, then the whole assembly snaps into place inside the OG Xbox.

Compatability
All original Xbox models.
2.5" hard drive / solid state drive