These work as described, but I had one major issue, The bolt that tightens the cross bar is screwed into Aluminum ring holding the bar. I mounted Yakima Sweet Roll saddles on the cross bars, and when I would load the kayak, the cross bars would turn in the aluminum ring. I kept tightening the bolt, until one of the aluminum rings stripped out. I had to have it tig welded, drilled and tapped to fix it, other wise it was unusable. In the middle of a trip, there was no other option (i.e., trying to get a replacement). I really believe this is a engineering failure. It uses a steel bolt, but the aluminum that it is screwed into cannot hold the tension needed to prevent the cross bars from spinning in the mount.