Flexible design allows for custom look using standard components. Allows for easy inventory count. Easy indentification of product. Four 30″ x 36″ zinc-plated wire shelves with patented QuadTruss design (patent #5,390,803). Shelf height can be adjusted. Ten chrome-plated full-height rods & tabs for ease of organization. Can be attached anywhere along shelf trusses without the need for tools. 74″ overall post height. All posts are numbered and grooved at 1″ increments for fast and level assembly.