Our COOKCOK 4-Tier Metal Storage Shelving Unit with Wheels. Foldable Shelf for Storage is constructed with powder-coated steel offers durable enough shelves to hold heavy bins and boxes. This garage storage shelf each shelf holds up to 250lbs(without wheels) if installed wheels each shelf only hold <200lbs(the top tier do not suggest put heavy duty goods). Slippery and durable wheels which can be rotated 360 degrees 2 of which have a locking function so there is no need to worry about slipping. When folded it can be placed in a narrow gap behind the door etc saving space when not in use and the side guardrail design can prevent objects from falling. No Assemble Required easy to use. Adult.