BYTECC BRACKET-535 5.25" Metal Tray for 2.5", 3.5" HDD/Slim DVD, Convert 5.25" Bays Allow 3.5 inches Drive size devices to be mounted in standard 5.25 inches Drive Bays. It works with 3.5" & 2.5" HDD and slim DVD drives This Drive bay mounting bracket has 3 combinations to fit HDD/slim DVD into a 5.25" Drive bay Maximize the internal space of your computer case for efficient usage Work with 3.5" & 2.5" Hard Drive and slim drives Different size screws included for mounting the bracket into the PC case