SilverStone RM61-312 6U 12-Bay Rackmount Chassis equipped with dual PSU compatibility, triple 360mm radiator supportGeneral Information Manufacturer SilverStone Part Number RM61 312 Product Model SST RM61 312 Product Type 6U 12 Bay Rackmount Chassis California Residents Proposition 65 Warning Bays Number of External 5. 25 Bays 3. 5" hot swap x 12 Number of Internal 3. 5 Bays 2. 5" x 4 Interfaces Ports Total Number of USB Ports USB3 Type C x 1 , USB3 Type A x 2 Physical Characteristics Color Black Material Steel Form Factor 6U Height 265mm Width 438mm Depth 552mm