The Industrial Add-On Unit is an extra strength, welded wire construction storage shelf. The open wire shelves are perfect for office storage, promotes air circulation & reduces dust accumulation. The storage shelf is furnished with wire shelves that adjust in 1 increments, & includes four steel shelves, four posts & snap-together clips. Series Name: Safco Industrial Wire Shelving; Shelf Type(s): Adjustable; Shelf Depth: 18"; Shelf Capacity (Weight): 1,000 lbs.