Pallet Rack Add-On Units with Wire Mesh Decking come with one pre-assembled upright, 4 beams and 4 wire decks (2 decks per level). Our heavy duty pallet rack features 3" x 3" columns. Constructed from 14 gauge steel, our uprights offer a maximum capacity of 20,867 lbs. (based on a maximum shelf spacing of 48"). The new bolt together design provides a lower cost of ownership because components can be easily replaced when damaged during use, while traditional welded uprights require replacement of the entire upright. Wire mesh decking utilizes heavy 6 gauge wire and 16 gauge U-shaped supports for added strength..  Wire grid openings are 2.5" x 4".