The Industrial Add-On Unit is an extra strength, welded wire construction storage shelf for addition to Model 5285, measuring 36 x 18". The open wire shelves are perfect for office storage, promotes air circulation and reduces dust accumulation. The storage shelf is furnished with wire shelves that adjust in 1" increments, and Includes four steel shelves, four posts and snap-together clips. Rated up to 1,250 lbs. per shelf. Gray powder coat finish for durability. Optional add-on unit and extra shelf pack.