This wire cart has a unique corner release system, coupled with double-grooved SiteSelect™ posts, to permit quick shelf adjustment in 1" increments. The shelves have a chrome plated finish over 18 gauge wire. This wire cart has protection in the form of 3 1/2" bumpers to protect from scrapes and scratches. Mobility is possible with 5" polyurethane swivel casters. This wire cart has four shelves each of them about to handle a 300 lb load.