"These clamps do the business for most jobs, but for precise work the "forgesteel" ones at only slightly more money are very much better. Alignment of these is a bit more sloppy than the alternatives, and the tightening thread much less smooth so more difficult to equalise pressures between clamps. However, I'll still keep on using these for rough work, just not buy more ."
"I'm staggered by the good reviews of these clamps - so much so that I've signed up with Screwfix JUST so I can post a review about how unspeakably useless and infuriatingly terrible this absolute *junk* is. I cannot begin to imagine what went through the minds of either the designer, the workers in the factory, or indeed the product buyer at Screwfix in that any of them thought that these pieces of utter rubbish would be in any way sucessful at clamping anything at all. It's true that you get what you pay for but regardless of how little I paid for them, I paid for CLAMPS so it's only reasonable to assume that at the very least they would function at clamping things. But no.
The design itself is so obviously flawed in that it relies on (poor, practically non-existent) friction in the serated edge to stop the moveable part of the clamp moving up the serated edge when you tighten the screw - which it fails spectacularly at. This means that as soon as you try and tighten the screw, instead of providing more (or indeed, any) clamping force between the jaws, it simply moves up the serated edge, often then falling off the two things you're trying to clamp.
The time, energy, and patience that I've wasted on these pitiful pieces of rubbish borders on offensive, and frankly I get angry even looking at them, in just how ultimately useless they are. Why did the factory even bother making them, and why on earth did Screwfix even bother buying them in? Save the frustration and dispair I've had to experience by avoiding like the plague. For the sake of the sanity of you and those around you, DO NOT BUY THEM."