Wire ShelvingChrome-plated storage shelves, can be order with a wire or solid sheet bottom to ensure that you meet healthcare codes. Shelves are adjustable in 1" increments, each shelf is built to hold up to 500 lbs. NSF approved, fire-retardant. Nylon fabric covers with hook and loop closures are available in four colors. Add-on chrome-plated enclosure panels allowing you to enclose the sides, back and entire unit to be a 3 sided shelf. The cart comes in two sizes to meet the 18"W and 24"W. Hooks onto top shelf and fits around bottom shelf. #935063 and #935066 include two panels only, all other kits include two side panels and two or three back panels (60" units). Does not come with casters.