4-Bay Backplane Adds 4X U.2 Sff-8639 Nvme Drive Bays To A Desktop/Server; Supports 7Mm To 15Mm 2.5" Ssds; Up To 32Gbps Per Drive Via Mini-Sas Sff-8643 Ports - Lockable And Removeable Drive Trays/Caddies With 2X Keys Included - Mobile Rack Features Two Rear Fans And Front Air Vents To Keep Drives Cool For Optimal Performance; Fan Switch For High/Low Settings - Includes 4X 2Ft Mini-Sas Hd Cables; Uses Sata Power From The Host Psu; Drive/Backplane Mounting Screws Included; Fits Into A 5.25" Bay