Server Accessories, 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 Improved Hard Drive Cooling. For Use On Rm21304, Rm21308, Rm22308, Rm22312, Rm43320Rs, Cs381 And Cs351. Silverstone Rm21304, Rm21308, Rm22308, Rm22312, Rm43320Rs, Cs381 And Cs351Specifications. Size 2.53.5. Dimensions: 4.213 In W X 1.102 In H X 6.850 In D