Nsf Certified 4-Shelf Wire Shelving Kit With Casters, 48w X 18d X 72h, Black Ideal storage solution for all your medium-duty commercial storage requirements. Snap-together design assembles in minutes. Strong welded wire construction provides exceptional strength and stability. Open design allows air circulation and reduces dust build-up. Up to 600 lbs. per shelf (evenly distributed) when used without casters. Casters (2 locking) provide mobility and can be omitted to increase weight capacity of unit.