Filter Filters Used Steel Rack Case Remove All Filters Price Under $50 (1) $100-$500 (2) Fit Guide Rack Gear (3) Rack Space 4 U (1) 6 U (1) 8 U (1) SKB Cases 1SKB-R6S Shallow 6U Roto Rack with Steel Rails Front/Back 10.5-Inch... $209.95 SKB Cases 1SKB-R4S Shallow 4U Roto Rack with Steel Rails Front/Back 10.5-Inch... $149.99 SKB Cases 1SKB-RRK8 8U Rear Rail Kit Compatible with 1SKB-R8 (1SKBRRK8) $39.99