Industrial wire shelving supports up to 1,000 lb. evenly distributed per shelf. Each shelf adjusts in 1" increments. Shelving is made of steel with a powder-coat finish, 10-gauge shelf surface, 3-gauge frame, and 6-gauge wave pattern. Easy collar-and-sleeve assembly requires no tools. Units can be expanded with use of add-on units and extra shelves. Starter unit includes four shelves and four posts. Add-on unit (sold separately) includes four shelves and two posts.