These shelves are the business!! They are relatively simple to put together even on your own. Because there are only 4 shelves, the spacing is pretty wide between, which means pretty tall containers can be stored as well as using the very top (if your ceilings permit, mine do). These shelves are solid & sturdy. I’m using them inside my home in what was going to be a garage area..my husband is now going to order them for our newly built separate garage area. He feels they can support heavy-duty tools & equipment.