These steel shelves are capable of holding up to 800 pounds per shelf and 2000 pounds per unit. The shelf unit comes complete with four posts equipped with leveler bolts, split sleeves, and four shelves. These steel shelves come with post increment ridges that are numbered to simplify shelf placement. The shelf unit is compatible with one inch diameter round post national brand components. These steel shelves are created from classic steel providing you with terrific durability.