Rack Mount 4U External SCSI Box CRM-4US-WT-2200 Drive Bay & Slot: 8x5.25" Open Power & Cooling: AT Power Supply ( Sold Separately ) Power Fan: 1x 8cm, Case Fan: 2x 8cm Dimension: Case Size: 17"9/16(W) x 7"(H) x 17"3/4(D) Weight: N.W.:22lbs, G.W.:32lbs Matching Sliding Rails: CRM-SL18 or ( CRM-SL20, or CRM-SL26 ) by drilling 1 extra screw hole ( sold separately )