Use this Delock installation frame in your free 3.5 bay of your computer to install up to two 2.5 hard drives.
For installation into 3.5 bay
1) 2 x 2.5 HDD with 9.5 mm height
2) 1 x 2.5 HDD with more than 9.5 mm height
Black metal frame
PC with one free 3.5 bay
Installation frame 3.5 > 2 x 2.5 HDD