DIMENSIONS: * Posts: 1" diameter, Single piece construction. * Casters: 5 x 1 1/4" * Casters add 5 3/4" to the height of the unit. * Outside: Add 9/16" to listed dimensions. * Shelf Thickness: 1 1/4"TEMPERATURE RANGE: -20 to 120 FMATERIAL: * Chrome-Plated carbon steel. * Rust resistant, not rust proof.WEIGHT CAPACITY: * Shelf capacity listed is the capacity for each shelf without casters. * Total Starter Unit with Additional Shelves: 4,800 lbs * Total Add-on Unit: 3,000 lbsADD-ON UNITS: * Not compatible with Corner Shelving.SPECIFICATIONS: * Casters: NSF Certified (National sanitary foundation)CASTERS: * Not included with shelving.