Stable structure to maintain heavy loads Swivel casters that maintain stability Durable materials used for longevity These grey serving carts can be used for various tasks. The aluminum uprights hold 3 polyethylene shelves that maintain integrity. These serving carts are durable enough to carry 400 pounds of weight. Use for serving food, stocking items or cleaning tables. The 40" x 21 1/4" x 38 1/2" unit has swivel casters that remain stable even over rough surfaces.