Works, but makes me nervous.
Crutchfield Customer Review (What's this?)
The metal section that goes in the rail itself on my Trailblazer is small. Honestly I'd thought I bough the wrong attachment, but it had our vehicle listed right in the manual itself. The piece of metal that holds the bracket to the roof has to be rotate to hold it in place, and it's barely long enough to put the screw in it AND still be able to move the bracket where you want it to be.The screw should have been longer and maybe some different sized metal pieces for different roof racks - I can't imagine that would cost much more. Other than that it's secure in place, so I guess it works.
Pros: Heavy Duty
Cons: Poor Design