This is 5 tier shelves for storage,all the shelf is can adjust height . The shelving unit is made of steel wire shelving.The weight limit for each shelf is 150 pounds, and the total weight limit for the entire shelf is 750 pounds. The storage shelves provide an enormous amount of space for you and no occupy too much space. You can use this wire shelving in the kitchen bedroom garage and more. Tools, books,household appliances and other things can be placed on this wire shelving.