I have not installed this, but this is definitely a substantial unit with solid metal and heavy thick shelves.  I wish the wooden shelves were not so dark in color.  I plan to use a wash on them to better blend with my decor.  A very useful and substantial piece .unlike many others out there.  The shelves slide onto rods that protrude from the metal uprights.  This will be used as a catch-all by the main entrance.