3ware Serial ATA RAID 4 Bay Drive Cage (RDC-400 SATA) Product Type - Drive Cage Dimensions WxDxH - 5.08"(129mm) x 5.85"(148.5mm) x 10.43"(265mm) Dimensions WxDxH - 5.08"(129mm) x 5.85"(148.5mm) x 10.43"(265mm) -- Require 3 standard 5.25" form factor slots -- Support up to 4 3.5 hot plugging ATA or Serial ATA drive trays with key locks