These sturdy chrome plated enclosure panels allow you to create a 3-sided cart. The panels come in 2 sizes to meet the 18" and 24" width of our units. Back panels are standard 24" panels for all units. These heavy duty panels hook on the top shelf and fit snuggly through the bottom shelf. Assembly takes minutes and secure with any size load. The LC18 and LC24 kits are the 2 side panels only. All other kits include 2 side panels and 2 (36" + 48" units) or 3 back panels (60" units).