iStarUSA Group 3x5.25 to 5x3.5 Trayless Black (BPN-DE350SS-BLACK) Aluminum frame, light weight and durability design Tray-less and screw-less HDD mounting Aluminum front bezel with metal Key lock mechanism for security Integrative Shaping aluminum design for quickest heat sink Supports hot-swap & RAID configuration (additional RAID controller needed)