http://www.rockler.com/product.cfm?page=10819

I bought some that look just like them from Homier and had to throw them out
immediately since the aluminum just ripped up when I tightened them.
So I bought some from HF that look just them. They have lasted much long,
but don't tighten up well and are starting to fail.
So I bought some good ones from Woodcraft
http://www.woodcraft.com/family.aspx?familyid=3963
They are very nice, but not cheap. I need some more clamps.

The Rockler are well priced, but they look like the Homier and HF crap.
So, has anyone used them?