Rack Mount Case 4U Economic CRM-4U-WT-4032 Drive Bay & Slot: 3x5.25" Open, 1x3.5" Open, 1x3.5" Hidden, 7 Slots Power & Cooling: ATX Power Supply ( Sold Separately ) Power Fan: 1x 8cm, Case Fan: 2x 8cm, 1x 12cm Dimension: MB Size:12"1/4(W) x 13"1/2(D), Case Size: 17"1/2(W) x 7"(H) x 20"7/8(D) Weight: N.W.:28.5lbs, G.W.:34lbs Matching Sliding Rails: CRM-SL18, CRM-SL20, or CRM-SL24TP ( sold separately )