Server Accessories, Lockable 2.5/3.5 Hard Drive Caddy For Silverstone Rm21304, Rm21308, Rm22308, Rm22312, Rm43320Rs, Cs381 And Cs351. Features. Support For 2.5/3.5 Hard Drives. Air Baffle Included For Airflow Management And Enhanced Hard Drive Cooling. Equipped With Anti-Theft Lock For Added Security. For Use On Compatibility Rm21304 / Rm21308 / Rm22308 / Rm22312 / Rm43320Rs / Cs381 / Cs351. Silverstone Rm21304, Rm21308, Rm22308, Rm22312, Rm43320Rs, Cs381 Cs351Specifications. Size 2.53.5. Dimensions: 4.213 In W X 1.102 In H X 6.772 In D