Genuine Quantum modular wire systems offer a unique combination of shelf and post sizes in a variety of finishes to compliment any application. The split sleeve and grooved numbered posts allow for easy and quick assembly. The all welded shelf construction is supported with architectural wire trusses to provide between 600 lbs and 800 lbs capacity per shelf. Unit also includes: 4 - 5" swivel poly stem casters, 2 with brakes, 4 donut bumpers. 1 Year warranty agianst defects.