Starter kit is designed to provide the essentials for wire shelving of this collection so you can expand and organize your storage areas. Kit includes four shelves and four posts. Each shelf 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. 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.