This foldable shelf organizer is easy to assemble with no tools required. the structure is very simple and you only need to spend 5 seconds to install it.Constructed from heavy-duty metal iron. Max loading weight is 220 lbs.The foldable storage shelves features 4 professional grade caster wheels for easy mobility .Foldable metal rack storage shelving for heavier storing and organization, It is great to use in living room, bedroom, kitchen , garage etc.