Muscle Rack URWM185BLK Black Steel Storage Rack, 5 Adjustable Shelves, 3000 lb. Capacity, 72" Height x 36" Width x 18" Depth Storage rack with five adjustable shelves and a 3,000lb. capacity is suitable for organizing and storing items Frame is made of steel for strength. Frame has smooth black finish for resistance to corrosion. 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 Rivet lock design for assembly without nuts or bolts, instructions included, tools for assembly sold separately. Note : Muscle Rack is Edsal brand name they use.