It was a heavy burden

Actually, I had imagined under a Schwerlastregal something else.
The shelves were neatly packed in.
When unpacking parts was me because of the many somewhat dizzy I abe made me cheerfully to work.
First stable work gloves tightened, because all parts were very sharp.
The fitting together the individual parts of a puzzle was because everything was very thin and partially bent.
The shelves are made of 8mm thick particle board, but thanks to the brace fulfill your purpose.
The shelf is not to be put down adapted to free, it wobbles and falls under certain circumstances to even.
So absolutely screw into the wall.
Since I needed three shelves I have this set up at an angle untereinnander screwed and dowelled.
Sorry, no connectors are included.
The shelf serves its purpose alledings I would have liked a little more stability and less sharp-edged parts.