muscle rack 5-shelf steel shelving, silver-vein, 24 d x 48 w x 72 h muscle rack this heavy-duty five-shelf unit is made of industrial grade steel with a durable silver-vein finish. z‐beam design beams add strength and rigidity. the shelves with particle board decking can be adjusted in 1‐1/2 increments. the unit includes a post coupler to make assembly faster and easier, no nuts or bolts required. it can be assembled vertically as a shelving unit or horizontally as a workbench.