Heavy-duty wire shelves add-on shelving unit allows up to 800 lb. shelf capacity. Add on kits come complete with 4 shelves, 2 posts and 8 s-hooks to be added to existing shelving units for continuous run. Additional shelves may be purchased separately. Proform finish is an economical solution for high humidity or wet applications. The carbon steel is treated with an iron phosphate base. A hybrid epoxy with an antibacterial agent is electrostatically applied over the treated surface.