3.5-Inch to 5.25-Inch Drive Bay Mount
3.5" Universal Hard Drive Mounting Bracket Adapter for 5.25" Bay
This metal kit will help you mount a 3.5" hard disk drive in a 5.25" bay and also help dissipating heat off the hard drive. It includes 2 metal frames & 8 mounting screws.
Use this kit when you run out of the internal 3.5-inch bays or if you want more space between hard drives to keep them cool.