The Dell 4JKNV-RFB 3.5-inch SAS/SATA G14-G16 tray is a carrier for a compatible drive bay in the designated server generation range.
Its 3.5-inch format and SAS/SATA designation identify the drive type and interface category it is made for. The tray holds the drive as a separate component; it is not a storage drive itself.
The listing identifies this part for G14-G16 systems. It is a drive-mounting part for that range, with no drive or other package contents specified.