Although I am very satisfied with the product itself, I think that there is a product with a bearing in the Duracon resin part, but I also want to handle it.
Instead of exchanging equivalent items, by setting the current dimension 33 to 42 of a larger size, we were able to support with a margin, opening and closing the sliding doors became very smooth. Installation requires somewhat processing, but if you enter a large size, you understand well that large also serves as a small. The material was also stainless. With this, it seems to be able to tolerate a considerable number of years.