These are really pretty.  We ordered several for a deck top garden.  The "pre-drilled" holes was a bit confusing in the instructions so I had to enlist my husband's help.  There are only pre drilled holes in some parts.  The screws are those self drilling ones.  This means you have to line everything up carefully to get the screws in the right place.  Once he took me through the put together, I did the rest on my own, and they went up quickly.  I plan on using liners in them because it looks like dirt may escape.  But they are beautiful and really clean up the look of our deck top.