Product Detail Install up to 2x 2.5 Inch Notebook, Laptop, SSD Hard Drives into 3.5 Inch Bay Supports One or Two 2.5" Notebook, Laptop, SSD Hard Drives Installs in to a single 3.5 Inch Internal Drive Bay (w/o any fans installed) You can attach one 80mm or one 70mm or one 60mm fan to this rafter (may take up extra 3.5" bay) BAY RAFTER 2.5 Rev. B . The "Scythe Bay Rafter 2.5 conversion to 3.5 bay Rev. B" is best product for you. We recommended Scythe Bay Rafter 2.5 conversion to 3.5 bay Rev. B