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Title: Nice to look at but a poor design.
Review: I purchased several of the 4" and 6" Irwin c-clamps and was immediately disapointed. Not only is the "double threaded screw" slow to adjust (you have to turn it twice as many times to tighten) it becomes difficult and binds before the screw reaches the maximum opening distance. The second time I used them one of the clamps broke while I was tightening it right at one of the bends in the "c" casting and gave my thumb a heck of a whack. I use c-clamps almost every day in my work as a boatbuilder and this has never happened with any of the "Adjustable Clamp" brand clamps that are in use at the shop. These clamps are pretty to look at but not worth the money. I would have given them one star but I was able to complete the glue-up successfully.
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