As technology advances, computer systems are becoming more compact, allowing the system to be easily transported and/or requiring less physical space. As a result, people are maximizing their system's physical space utility to retain the same functions in a compact space with the use of improved hardware components. Made for Space Saving The FLEX-FIT Duo MB343SPO is a lightweight yet durable 3.5-inch to 5.25-inch mounting kit bracket that utilizes a single standard external 5.25" computer bay to accommodate a 9.5mm Ultra-Slim ODD (optical disk drive) and a 3.5" HDD / device. This would ultimately maximize your system space, allowing the user to fit more devices into a smaller space. Advanced Drive Guiding System Thanks for our advanced drive guiding system; the device installation process is very easy with the FLEX-FIT Duo MB343SPO. Simple Tool-less 3.5" Device Installation To install your 3.5" device such as card reader or audio control panel, just slide in the device until you heard a click, which indicate the Smart-Tip locks has locked the 3.5" device into place. For extra security, optional screws (included) can be added to each side. Ultra Slim ODD & 3.5" HDD Installation To install the Ultra-Slim ODD or 3.5" HDD, simply insert your Ultra-Slim ODD or 3.5" HDD into the FLEX-FIT Duo and secure the device with included screws. Included 6pin Slimline to 15pin SATA Power Cable If a 6-pin Slimline ODD power connector is not available in your system, we have included 6 pin Slimline to 15 pin SATA power cable for your convenience. Detachable Dust Covers Additionally, a dust cover for Ultra-Slim ODD bay and 3.5" device bay are included and can be snapped-off from the bracket for you to insert it into the front panel slot. This allows the exposed slots to be covered when not in use. Beautifully Crafted Design The FLEX-FIT Duo MB343SPO is engineered with the utmost dedication to building the most efficient and reliable product possible. Using a unibody, sturdy plastic open frame design, it provides excellent durability and at the same time, allows for maximum airflow and efficient passive cooling by convection. As a result, this reduces the chances of mechanical failures due to overheating. Because the bracket is a single piece design, it uses absolutely zero moving parts while retaining all core functionalities of the bracket. Build Flexible Since the 3.5" bay on FLEX-FIT Duo MB343SPO takes both 3.5" hard drives and 3.5" devices, there are many build options to choose from. For example, adding a 3.5" device; the ToughArmor MB993SK-B would give you a maximum of three hot-swappable 2.5" HDD/SSD bays, while adding the EZ-Fit Trio MB610SP SSD bracket will give you up to three internal 2.5" HDD / SSD bays. The FLEX-FIT Duo MB343SPO's 3.5" bay is also compatible with USB 3.0 hubs, multimedia card readers, fan speed controllers, and audio output ports that are in 3.5" device form factor. Suggested Applications Any system with standard 5.25" computer bay available Compatible 3.5" / Ultra-Slim ODD products 3.5" hard drives, 3.5" USB hubs, 3.5" multimedia card readers, 3.5" HDD/SSD mobile racks, 3.5" HDD/SSD brackets, Ultra-Slim ODD to 2.5" HDD adapter, and Ultra-Slim optical disk drive.