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Title: Poor quality and design
Review: The 'screw type' closing mechanism does not work well as the screw slips when you tighted the clamp. It does form a nice 90 degree angle if the clamp does not slip - I bought 2 clamps and only one 1 of the 4 screw tighteners actually works. I might be able to fix this by modifying the whole the screw tightener uses, but I shouldn't have to fix the poor design of this product. I will use another manufacturer next time.
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