The worst thing I have bought in years, no instructions in the box, the height cannot be adjusted no matter how hard I tried. I wonder how they sell it.

By far the worst thing I have bought in the last 5 years, maybe even more. I regret the 30€ I spent. Poor construction. Unclear and missing assembly instructions. It's no coincidence that there is nowhere on the web, in this digital age we live in, an instructional video from the manufacturing company (wenko). Probably because they themselves can't fix it. I will just say that there is an indication on the assembly paper that if you want to reduce the length of the shelf's axis, you have to cut the iron pipe with a hacksaw! Even if you manage to assemble it, there is no guarantee that it will stay in place.