I used it for the railings of my house.
It is good that we can buy it cheaply because similar things will be 400 yen at the local home center. The thing itself is not bad, I am feeling secure. It is a good thing without making a complicated place.
It is for 33 mm but it was used for a 32 mm dimple round bar. Even if you look at anything for 32 mm, it is about twice this amount, so if it is an error of 1 mm it will be OK. I tried installing it, and it was possible to install firmly without discomfort.