The SeriTek/1EN2-TR spare hard drive tray works with the SeriTek/1EN2 External Two-Bay Serial ATA Enclosure. It can be used to hold an additional hard drive that can be swapped in and out of the SeriTek/1EN2 enclosure for virtually unlimited storage possibilites. Key Features and Benefits Key-lockable removable tray Supports one Serial ATA hard drive Hot-swap compatible with the SeriTek/1EN2 Enclosure Package Contents One Removable Hard Drive Tray Two Additional Keys Four Countersink-style Hard Drive Mounting Screws |