With 1x 12cm Cooling Fan Install Slot space. This hard drive cage size is about 3 times 5.25inch CD-ROM slot size. Holding 5x 3.5inch Hard Drive Size let you extend 5 Hard Drive easily Please pay attention to the size of the cage and make sure there is enough room for it in your PC case. It fits for PC Case which CD-ROM Slot Inwall is flat, or Bracket Installation Type CD-ROM Slot, Some PC case may not support this Hard Drive Rack, then you can only DIY your PC Case or use it External Model Number:HDD Hard Drive Cage Rack color:Silver + black Material:Plastic + Metal Package Contents: 1 x HDD Hard Drive Cage Rack 10 x 3.5inch HDD Install Brackets 8 x Fittings Only the above package content, other products are not included. Note: Light 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.