This is an adapter that I made for my son. No screws are required. The SSD drive or 2.5 hdd is held in the tray by four tabs which you may need to file to fit your drive. The holes in the side rails are meant to be used by a quick change adapter and are 3mm in diameter. I made the adapter in Cubify Design 2014 and printed it on a DaVinci 1.0 3D Printer.