Casafoyer Technology 4U Rackmount Server Chassis with 3 X 5.25 Front Bays with CEB/ATX/mATX/Mitx Support RM400 Cases SST-RM400 - Pack of 2 Pack of 2 — combo value pack. Supports up to SSI-CEB motherboard. Supports ATX (PS2)/Mini redundant power supply up to 160mm deep Supports standard profile PCI/ PCIe x 7 slots. Three 5.25" Drive Bays for flexible 5.25" Device installation Front door with key lock for extra security. 5Gbps Super speed USB 3.1 Gen 1 interface, backward compatible with USB 2.0/ 1.1