Heavy duty steel construction with durable silver enamel finish. Five shelves with wire decking can be adjusted in 1-1/2" increments. Multi-functional, 3-way beams can be set up as a flush shelf or tray shelf. Rivet lock system provides strength and rigidity and is easy to assemble, no nuts or bolts. Unit can be assembled vertically as shelves or horizontally as a workbench. Unit is NSF Certified.