SIIG 3.5-Inch to Dual 2.5-Inch Drive Bay Adapter (SC-SA0H12-S1) SIIG's 3.5 to Dual 2.5 Drive Bay Adapter easily adds two 2.5 drives to any 3.5 drive bay. -Adapts standard internal 3.5 drive bays to two 2.5 drive slots for use with 2.5 hard disk drives-Great for use with standard 2. SIIG's 3.5" to Dual 2.5" Drive Bay Adapter easily adds two 2.5" drives to any 3.5" drive bay.SIIG SC-SA0H12-S1 Laptop HDD Adapter - with this 3.5" to dual 2.5" drive bay adapter, you can hook up two laptop hard drives into your desktop PC, letting you easily set up high capacity storage or high speed RAID arrays in a small form factor space. This dual laptop HDD mounting bracket is made of durable, high quality plastic. Great quality mounting bracket for SSDs and for 2.5 inch laptop drives.