This wire cart consist of 18-gauge wires that are finished in a durable chrome-plated finish. The double-grooved SiteSelect™ posts permit quick shelf adjustments. The wire cart allows for 1" shelf adjustment increments so that you can arrange the shelves properly to fit your content. Each unit has 3 1/2" donut bumpers that help to protect the walls from any kind of damage. The wire cart also has 5" polyurethane swivel casters.