36 x 18 x 60 4 Shelf shelving unit. Black steel industrial shelving unit with four adjustable shelves and a 3,200 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 inch increments to accommodate items of varying heights. Frame has black baked enamel finish for resistance to corrosion. Rivet lock design for assembly without nuts or bolts, instructions included.