Specifications:1. Size: 3.5 2. Compatible Part Number: For Lenovo RD3303. Works with the following server: For Lenovo 03X3969Features:1. This hard drive caddy tray is an important accessory for your beloved laptop.2. Made of high quality material, it can be used for a long time.3. Featured with plug and play installation, this hard drive caddy tray is easy to use.4. With an additional hard drive, your system and storage capacity can be expanded largely.5. In addition, it is with modular construction, you can just remove the CD driver and put this in the slot.6. High efficient, this can be connected with your laptop fast and reliably and giving you a reliable performance.7. Overall, this fabulous item will exceed your expectation!Package Include:1 x Hard Drive Caddy Tray4 x Screws