These bright shiny chrome plated carts are as versatile as they are practical. Four sturdy 18" x 48" wire shelves have full shelf length center supports for outstanding strength. Shelves are adjustable in 1? increments. Each shelf can hold up to 500 lbs. of evenly distributed weight. The casters are rated for a maximum total weight of 1,000 lbs. per unit (250 lbs. each). When used in conjunction with our flame retardant 200 denier urethane coated nylon cover and plastic insert for the bottom shelf you can transport this unit in any healthcare environment and meet applicable codes. All sizes roll easily on our quality 5" casters - two locking. Covers are available for all size units. This unit is NSF approved. Easy to assemble without tools.