I have some highly rated clamps from hf (Tool Space) and to be honest I have no idea how well constructed they are or not. Compared to my more expensive tweeter clamps, the thumb seems a bit shorter, but the metal and construction seem about the same. The big question is whether they work. I personally can't say. They hold my parts just as well, don't slip, but are generally cheaper. But to be honest I bought them for my own router table that I make so I haven't used them yet but have for a few jobs so far.
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