ITEM NAME:4 Bay 2.5 To 3.5" HDD Metal Adapter Mounting Bracket Hard Drive Disk Holder Rack.Features: SU303 2.5" to 3.5" All-Aluminum Hard Disk Rack (Floppy Drive 4 Positions Design). As long as the position can hold the 3.5" hard disk, the rack can be inserted. Made of the about 2mm/0.08" thick aluminum alloy, it's hard to deform and quick to dissipate the heat and provides the maximum protection for your hard drive.