SCSI4ME&reg; 2.5" SFF Drive Tray Caddy for IBM/Lenovo X3650 M5, X3550 M5, X3250 M5, X3850 X6, X3950 X6. 00E7600 L38552 Aftermarket drive caddie. Functions 100% as original OEM caddie. This caddie is 2.5". It won't work for servers with 3.5" hotswap drive bays. Compatible with the following IBM / Lenovo servers with 2.5" hotswap drive bays: X3650 M5, X3550 M5, X3250 M5, X3850 X6, X3950 X6 4 x mounting screws included.