Starter kit is designed to provide the essentials for industrial wire shelving so you can expand and organize your storage areas. Kit includes four 48" wide x 18" deep shelves and four posts. Easy collar-and-sleeve assembly requires no tools. 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. Weight capacity is 1,000 lb. evenly distributed. Units can be expanded with use of add-on units and extra shelves. Add-on unit (sold separately) includes four shelves and two posts.