Edsal URWM184872BK Black Steel Storage Rack, 5 Adjustable Shelves, 4000 lb. Capacity, 72" Height x 48" Width x 18" Depth Storage rack with five adjustable shelves and a 4,000 lb. capacity is suitable for organizing and storing items 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 is made of steel for strength, 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 Starter includes 2 front box posts 2 rear angle posts 6 shelves 24 shelf clips 2 side cross braces 1 back cross brace and hardware Product does not come with post couplers