pratique, efficace, maniable et de bonne qualité.

Good tool. Plenty of grip and power for compression nuts. Must have tool for plumbers

Excelente ferramenta, sem dúvida a melhor chave tipo inglesa q existe, parabéns Knipex

Work great, very sturdy, surprisingly thin.

Why would someone pay 2 to 3 times what they could get a comparable 'cheapo' adjustable wrench? Because it is worth it.I already had the 10 inch, and found the 12 inch is just as high of quality, with a little longer handles for more leverage, and appears to be a little stouter all around.For those who have never used a wrench like this, I'll give a quick rundown. You adjust the opening by pressing a spring loaded button, and sliding the movable jaw to a wider or narrower opening, as needed. Once set, it does not move, until you re-set it, unlike some adjustable wrenches, that will wiggle more open or shut. There is a little lever on the movable handle, that engages the movable jaw, so that the tighter you squeeze the handles together, the tighter the grip on the bolt. I have yet to have them slip, even on rusted or partly rounded bolts, in fact I believe one would be more likely to twist off a smaller bolt, than have the jaws slip, they hold that well.The jaws are as close to absolutely parallel as I have ever seen, so much so that I can grip half a penny with the 12 inch pair, the other half with my 10 inch, and with a twist of the wrist, the penny is cleanly sheared in two.The biggest bolt size I have used it on so far, is 1 1/2 inch, and they open just a little wider than that.One other nice feature, is that about 95% of the time, you can size it, so that it grips the bolt tightly, but when you open the handles up, the jaws open enough to allow them to rotate around the head. This makes for fast turning of bolts, as with a little practice, you just squeeze, turn, release, allow the jaws to rotate around the head as far as you can, and when you squeeze again, they grab the next flat.One other very, very handy use for these, would be in assembling roller chains. I do maintenance on a farm, and used to have difficulty assembling the master links on large roller chains. With their parallel jaws, and cam action to squeeze the jaws together, they make the job much, much simpler. I am thinking of getting a small pair, for doing the o-ring style chains, like on motorcycles, they help that much.About the only negative to them, other than price, is that they are directional, in that pulling them one way, they will almost never slip, but pulling the other way, they are not so secure. This can be a problem in a situation where there is not enough room to flip the tool over. A small quibble, for such a good tool.If you can justify the price, you will not be disappointed.