Attach Safco’s Adder Units to your Industrial Wire Shelving Starter Units for an affordable way to store and organize supplies. The open-air design of the wire shelves cuts down on dust and makes it easy for you to find what you are looking for. This adder unit comes with four shelves, two posts and snap-together clips. The clips allow you to adjust the height of your shelves in 1” increments, without the use of tools. Adder units don’t stand on their own; you’ll need to attach them to other adder units or a starter unit. At least one starter unit is needed in any row of shelving. Store your heaviest chemicals and boxes on the units because each shelf holds up to 800 pounds. Choose a black or metallic gray powder-coat paint finish.