Starter kit is designed to provide the essentials for industrial wire shelving so you can expand and organize your storage areas. Kit includes four shelves and four posts. Easy collar-and-sleeve assembly requires no tools. Each shelf supports up to 1,000 lb. evenly distributed and adjusts in 1" increments. Shelving is made of steel with a chrome powder-coat finish, 10-gauge shelf surface, 3-gauge frame, and 6-gauge wave pattern. Units can be expanded with use of add-on units and extra shelves. Add-on unit (sold separately) includes four shelves and two posts.