This wire cart has a unique corner release system that is coupled with double grooved SiteSelect™ posts, for quick self adjustment in 1" increments. The shelves are 18 gauge wire with durable chrome plating. This wire cart comes equipped with 3 1/2"donut bumpers to protect walls. Unit has 4-5" polyurethane swivel casters for easy manuevering. The wire cart is equipped with 4 shelves that will hold 300 lb capacity per shelf.