3.5" HDD Mounting Kit for 5.25" Bay. Mount your 3.5" hard disk or solid state drives into a 5.25" drive bay using this handy mounting bracket from Syba (SY-ACC35017). This kit is perfect for smaller cases with fewer bays where those using multiple data drives may start to feel a size pinch. Using this 3.5" to 5.25" adaptor bracket you'll be able to install your drives wherever you need them. You can use it for more than just data drives too, card readers, floppy drives, fan controllers, and other 3.5" bay devices can be converted as well. SYBA Accessory SY-ACC35017 Dual 3.