This wire cart has a unique corner release system. Coupled with double-grooved SiteSelect™ posts, permit quick shelf adjustment in 1" increments. Each wire cart is constructed with 18-gauge metal that is finished in a durable chrome-plated coating. The 3 1/2" donut bumpers protect walls as well. Additionally, the wire cart has 5" polyurethane swivel casters with 300 pound load capacity per shelf.