This product is either discontinued or we cannot get that from suppliers.
Vantec HDA-250M, 1 x 2.5" Drive to 3.5" Bay, SATA Hard Driver, Device Size 2.5", Metal.
The metal Vantec 2.5" to 3.5" HDD/SSD Mounting Kit lets you easily mount one 2.5" HDD or SSD up to 15mm thick in a single 3.5" drive bay.