(6 Pack) 2.5" IBM 44t2216 SAS Scsi SFF Hard Drive Tray Caddy for X3650m2 X3550m2 Part Number: 44T2216 Fit Model Compatible with the following ProLiant servers that uses 2.5" SFF drives : X3650M2 X3550M2 X3680 X3690M2 Package 1 x 2.5" Hard Drive Caddy 4 x Drive Mounting Screws