This mobile shelving comes compatible with one inch diameter round post national brand components. The metal shelves can hold up to 800 pounds per shelf and 2000 pounds per unit. This mobile shelving comes with four posts equipped with leveler bolts, split sleeves, and four shelves. The metal shelves are created from classic steel giving you unbelievable durability. This mobile shelving is the perfect way to organize and store all your products and supplies.