This wire cart is a four shelf unit that will hold a 300 lb load per shelf. The shelves are 18 gauge wire with a chrome plated finish. This wire cart sits on 4-5" polyurethane swivel casters equipped with 3 1/2"bumpers to protect the walls. The unit has a unique corner release system coupled with double grooved SiteSelect posts that permit quick shelf adjustment in 1" increments. This wire cart requires assembly when purchased.