I bought these to fit onto the flight case of my 32 channel mixing desk.
They fitted easily onto the case with a couple of nuts and bolts (i don't have a riveting gun) and they feel really sturdy.
I was concerned about durability and strength as they are made of plastic, however having fitted and used them they are fantastic. Previously my desk was a 2 man lift from the car/van into the venue, and although I still need somebody to help me to put it onto my stand, it is now very much a one-man job to move it into the venue quickly and easily.
Highly recommended, especially at this price!