Our COOKCOK 5-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.