Four boards on an all-metal frame reach 54.5 in without a single wooden upright, which is why the whole unit rates 200 lbs while weighing just 27.5 lbs itself. Powder coating over the 1.57-in by 0.79-in tubing resists the rust that bare steel picks up in a kitchen or a sunroom. Each 0.59-in board sits on that frame, and threaded foot pads screw up or down to level the shelf on tile grout, floorboards, or a settled floor. The base clears the ground by 7.5 in, so a broom or vacuum head passes right under.