1.shelves and hook as well as hanger attach to. 2.Back and side mesh 3.standing stable Thanks for Looking HC-A5, wire mesh back shelving .When you put your products on shelves,you think that is not enouth ,OK,you also can put them on the back mesh by hooks.If this aslo not enouth,OK,we can supply tube hanger so that you can put some heavy products.Not only this ,some shorter shevles are avalible ...