This product, and and it is much better and nicer than the standard corner brackets. Its build quality is very high.
The only, slightly negative thing to point out, is a small color variation to the red 40x40 brackets.
In difference to the black brackets, the red ones can be used with standard ISO 4017 M8 bolts with a 13mm head.
Rated 4 out of 5
Trak Racer EU
Thank you Axel. :)