1. HDD Hard Drive Rack. Holding 3x 3.5inch Hard Drive Size let you extend 3 Hard Drive easily(2 CD-ROM drive positions)! 2. It fits for PC Case which CD-ROM Slot Inwall is flat, or Bracket Installation Type CD-ROM Slot. 3. Please pay attention to the size of the cage and make sure there is enough room for it in your PC case. 4. Some PC Chassis may not support this Hard Drive Rack. 5. Note: if you want to drag the CD-ROM in the case with 2 CD-ROM positions, you need to flatten the small iron sheet before installing it. Note: hard disk is not included. Colour:Black+Silver Material:metal Size:17 x 14.5 x 8.5cm Package Contents: 1 x Hard Drive Cage with matching screw and card strip Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.