Lian Li Internal Hard Drive Mounting Kit HD-321 3.5 to 2x 2.5 Designed for most cases that have 3.5 internal HDD storage space. Convert one 3.5 bay to 2 x 2.5 bays Includes anti-vibration rubber ring for use with Lian Li case. 102mm x 125mm x 25mm ( W, D, H) Aluminum structure