Casafoyer Technology RM41-506 4U rackmount Server case with six 5.25" Drive Bays, SST-RM41-506 - Pack of 2 Pack of 2 — combo value pack. Supports up to SSI-CEB motherboard Supports Standard profile PCI / PCIe x 7 slots Six 5. 25" drive bays for flexible 5. 25" device installation 5Gbps Super Speed USB 3. 1 Gen 1 interface, backward compatible with USB 2. 0 / 1. 1