Dell 3.5″ to 2.5″ Hybrid Adapter Bracket,...

Dell PowerEdge Caddy Hot-Swap 2.5″ To 3.5″ Adapter Bracket DPN: 09W8C4 WWGPK
Brand: Dell
Part #: 09W8C4 WWGPK
Alt Part #: Y004G ,0Y004G, N6RRK, 0N6RRK ,CN-0Y004G-42940-99N-00P7-A00, CN-ON6RRK-42940-017-00AX-A00
Type: Adapter Bracket

Key points to note on these WWGPK Dell adapters:-

This adapter is specially designed to allow a 2.5-inch Hot Swap SAS/SATA Hard Drive or SSD, SATA or SAS, to fit into a Dell 3.5 LFF Hot Swap Hard Drive Tray. This adapter combined with a 3.5-inch Hard Drive Tray and 2.5-inch Hard Drive will allow you to create what has become known as a Dell Hybrid Drive.

In a nutshell then,

:: This mounting bracket / adapter allows one 2.5″ hard drive to be mounted in a hot swap tray / caddy intended for 3.5″ devices. The unit can then be inserted into a server with a 3.5″ hot swap backplane.
:: This adapter will work with the following:
3.5″ Dell drive trays : 0F238F, F238F, 0X968D, X968D, 0G302D, G302D F9541 MF666 H9122
3.5″ HP drive trays : 651314-001 651320-001 373211-001 373211-002
:: Brand suitability: Dell, HP, Lenovo servers and storage systems that use 2.5′ SAS / SATA drives