Rosewill RSV 4 x 3.5-Inch HDD Cage RASA-11001 HDD tray: 4 x 3.5" HDD Fan:1 x 120mm Dimension (L X W X H) : 8.27" x 5.12" x 5.9" (21 x 13 x 15 cm) Design only as an add-on module for Rosewill RSV-R4000 and RSV-L4000