Received the mounts for my 42L boxes and was slightly skeptical about them holding on to the boxes well. After install and a few miles they seem to be holding up well and just to be on the safe side will add the locking bolt into my routine checks to make sure everything stays right and tight. A bit expensive for a set of 4, and locating instructions for mounting (supplied QR code went into the dark abyss) found a video on YouTube. Yet, if your going with the Alubox then this is your off the shelf solution, and I think it is working as expected