JARKE Button-On Cantilever Rack arm design lets you load racks either manually or with a fork truck. Arms adjust on 4" centers and attach without use of tools, bolts, or pins. Each arm holds up to 1000 lbs. 12,000–17,000-lb. total capacity for single column, not including base and 24,000–34,000-lb. capacity for double arm. Brace sets provide 3', 6', or 8' column centers (purchase separately). Two or more columns can be assembled into a continuous system. 7' and 10' heights. Made in USA.NOTE: For complete single- or double-sided rack, order two columns, number of arms you need, and either 3', 6', or 8' wide brace set.