Imagine one cart that adjusts to meet all of your needs! Adjusting to multiple heights is as simple as resetting four screws. Open, roomy shelves provide ample storage space. All-steel welded construction , die pressed shelves and 4" casters (two locking). Power paint finish. Top shelves are arc welded and reinforced and come complete with a non-slip rubber mat. "E" Models feature a UL and C-CUL Listed, 2-Outlet electrical unit with a 20 Ft. extension cord and cord winder.