Edsal Black Steel Storage Rack, 5 Adjustable Shelves Storage rack with five adjustable shelves and a 4,000 lb. capacity is suitable for organizing and storing items Frame is made of steel for strength Shelves are made of particle board supported by double-riveted beams and braces, and adjust in 1-1/2" increments to accommodate items of varying heights Frame has smooth black finish for resistance to corrosion Rivet lock design for assembly without nuts or bolts, instructions included, tools for assembly sold separately