Scythe BAY RAFTER 2.5 Rev. B for 2x 2.5 Inch Notebook, Laptop, SSD Hard Drives into 3.5 Inch Bay: BAY RAFTER 2.5 Rev. B (Retail) Bay Rafter 2.5 allows the installation of a max two 2.5" HDDs or SSDs in a 3.55" bay and provides a fitting opportunity for a fan with 80, 70 or 60 mm in size. By this, users can perfectly choose between high cooling power, low noise level or passive mode. You can also attach one 80mm or one 70mm or one 60mm fan to this rafter to create a hard drive cooler. Please note that if you attach a fan, this setup may take up to TWO 3.5 Inch Bay inside your computer case. If you do not install a fan, then just a single 3.5 Inch Bay is needed. Optimal mounting of HDDs: With the Bay Rafter 3.5, max. two 2.5" hard disk drives or SSDs can be mounted perfectly in the 3.5" drive bays of a PC chassis. Wide range of fans supported: The Bay Rafter 2.5 offers mounting options for all 3 common fan dimensions. The user has the choice to mount one 80 mm, 70 mm or 60 mm fan.