The SSD enclosure may be required if your case does NOT have a 2.5 in drive bay. It allows you to install the SSD in the enclosure and then the enclosure in a standard 3.5 in drive bay!

Black 2.5 to 3.5 Tray Adaptor for 2.5 SSD's & HDD's

Akasa SSD & HDD Adapter Fit a 2.5" SSD or HDD into a 3.5" PC Internal Drive Bay