Dexion Longspan 3 Steel Shelf Kits Steel shelf kits for adding additional levels to Dexion Longspan 3 Shelving. Ideal for expanding the capacity of longspan shelving systems, or replacing damaged shelves. Hard wearing and high load capacity steel shelf kits Shelf kits consist of a series of steel panels that form a complete shelf Choose from 6 sizes: 2100mm(w) x 450mm(d) steel shelf kit 2400mm(w) x 450mm(d) steel shelf kit 2100mm(w) x 600mm(d) steel shelf kit 2400mm(w) x 600mm(d) steel shelf kit 2100mm(w) x 900mm(d) steel shelf kit 2400mm(w) x 900mm(d) steel shelf kit