One layer [free installation + 0 universal wheels + 2 buckles] ♢☆, Five layers [free installation + 4 universal wheels + 10 buckles] ♢☆, Six layers [free installation + 4 universal wheels + 12 buckles] ♢☆, Four layers [free installation + 4 universal wheels + 8 buckles] ♢☆, Three layers [free installation + 4 universal wheels + 6 buckles] ♢☆, Second floor [free installation + 4 universal wheels + 4 buckles] ♢☆
