Modular Bulk Storage Rack Add-On Unit without Decking - 3 Levels This Add-On Unit includes 2 T-posts to make expansion easy and join units with more stability and less construction than bolting 2 starter units together. Boltless design snaps together securely without tools or hardware. Open design allows access from all sides. Roll formed 14 gauge steel uprights ensure rigidity. Levels adjust at 1-12" increments without disassembly. Scratch resistant enamel finish. Includes 2 upright T-posts and 3 sets of horizontal beams to support all 4 sides of 3 levels of decking. Supply your own decking.