Optional Flex-Fit MB343SP for External 5.25 Bay When using FlexiDOCK in an external 5.25" drive bay, Flex-Fit MB343SP can be used as an adapter for converting an external 5.25" drive bay into an external 3.5" drive bay. To learn more about Flex-Fit MB343SP Short Product Description : ICY DOCK flexiDOCK MB521SP-B 2.5 inch Hot-Swap SATA / SAS HDD / SSD Dock Trayless Mobile Rack Backplane Cage for External 3.5 inch Drive Bay Product Name : flexiDOCK Model Number : MB521SP-B Color : Black Support Drive Size : 2.5 inch SSD / HDD Compatible Drive Type : SATA / SAS (SAS host required / Single channel) Number of Drives : 1 Max Drive Height : 15mm Drive Bay : 1 x external 3.5 inch drive bay Host Interface : 1 x SATA 7pin Power Input : 1 x SATA 15pin Transfer Rate : Up to 6Gb/sec (Depending on hard drive speed) Support HDD Capacity : No Limitation Drive Cooling : Metal heat dispersion with passive cooling RAID Function : None Structure / Material : Metal with parital plastic Support Hot-Swap : Yes Drive Security : None RAID Status LED Indicator : None