I modeled it with nurbs based on the shape of an old wrench that I think it is French.
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Well, actually the French call it an “English wrench” (clé anglaise)… 
In UK English, it’s an “adjustable spanner”.
For me, it’s a “monkey wrench”. 
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As senior Kyle Houchens offered me in one of my posts that I go to model manufactured things in the real world, instead of designing my own plans, I just searched for a wrench in the internet and chose that one as a model, without have any information about its national history, but in our area, I think, it is called French wrench, also this one:
I myself am the inventor of a new type of the Ratchet Wrenches that I innovated it five years ago (I have its patent) but never disclosed it anywhere and never offered it to a relative industrial factory.
Its primitive design (descriptive) is here, but the final model is different. I designed it based on four models, and each model is used for a particular purpose.
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In Canada, in the West they call it a Crescent Wrench (the 2D cartoon picture at least). In Eastern (far Eastern) Canada they might call it a thumb wrench.
The “French” wrench is similar to what we’d call a “Pipe Wrench”. Definitely not the easiest thing to model. And therefore I must say great work!! Your turn-around time was pretty quick as well, as I also saw the previous topic you referred to.
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I’m not sure what a “French wrench” is…
There is a major difference between an adjustable wrench and a pipe wrench.
A pipe wrench has the rigid jaw closest to the handle and the movable jaw farther away from the handle. This has the effect of the movable jaw pivoting to clamp down on whatever is being gripped between the jaws when force is applied in the correct direction to gain this advantage.
An Adjustable wrench has the fixed jaw (the jaw that is rigidly attached to the handle) farther from the handle than the adjustable jaw. Adjustable wrenches are used for clamping on the flats of nuts and bolts .
This is a pipe wrench:
Another major difference is that pipe wrenches have serrated jaws while adjustable wrenches don’t.
Many people assume that an adjustable wrench works best when force is applied in the same direction as a pipe wrench. Actually an adjustable wrench will work best if its used in the reverse direction of a pipe wrench. This is not well known because the advantage of of using a pipe wrench correctlly is much greater than the advantage of using an adjustable wrench correctly.
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All right 
Also, a pipe wrench doesn’t need to be adjusted accurately like adjustable wrenches, it is enough the jaws of the pipe wrench touch the middle part of the pipe, then gripping happens when the handle is moved up or down.
Well, the “monkey wrench” will still have its place in the plumber’s toolbox, as it’s often used for tightening threaded couplings like a pipe union, which characteristically have large octagonal nuts of varying sizes.
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Aside from the topic, what a beautiful environment you live in; with the blue sea, green grounds, and attractive snowy mounts
in Austria we call it Franzose either (meaning French), but i never heard of a monkey wrench 
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Definitely a term used in the US.
Also used in “throw a monkey wrench into the machinery” (or variations on the theme) meaning to severely hinder or sabotage something:
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with a lot of etymological theories, could look a bit like a monkey… my first thought was because a monkey can grab like that? 
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just couldn’t resist
looks more like either an older version of it or a combination or its for smaller pipes only, you definitely would not be able to handle one inch pipes with that
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Also often referred to as a Stillson wrench after the original patent holder of this design. The patent was licensed to several manufacturers and is long-expired, but like the Hoover, the generic name prevails. I’d always say, “Pass the Stillson” if I wanted the monkey to fetch one of these from the toolbox.
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“monkey Wrench”
Also a bangin’ Foo fighters song…
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Well a plumber might not agree with that.
Its really not a question of accuracy.
In either of the two cases the adjustment should be made after the object to be gripped is already positioned between the jaws. Typically the operator makes the adjustment until it gets as far as it will go.
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well i must agree on that, when i was young i made an apprentice as a plumber, our wrenches looked like one of these, powerfull bite and finely adjustable. you get these in different sizes either.
the fine adjustment really is absolutely mandatory, otherwise you might not get enough grip on the pipe.
looking at it i would call it t-rex 
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Generally, the pipe wrenches that I redesigned and senior Helevetprsaud called it “monkey wrench” have teeth on their both jaws. Creating such the teeth are not necessary in other wrenches that deal with screws and nuts, but are considered as a disadvantage.
Usually, unlike other types of wrenches, the monkey wrench has a high tolerance (looseness) that helps the teeth to catch the pipe, when it is revolved around the central axis of the pipe.
When the user moves the handle of the wrench up or down the jaws come close to each other in two specified points due to the high tolerance, and thus, the teeth grip the pipe without needing for an accurate adjustment.
The wrenches that are used for opening or closing screw and nuts should have smooth jaws to be fitted with the screw or nut accurately, and if not, the wrench slides on the edges of the screw and damage the edges. Such the adjustable wrenches should have minimum tolerance.
Opening a nut with a monkey wrench is difficult and damages the nut due to its high looseness and also the harsh teeth.
t-rex performance is based on the direct pressure of the user’s hand and is different with the monkey wrench that works with a single handle. I think, this wrench is suitable for weaker and thinner pipes and is not good for the larger, thicker and steel pipes.
maybe there is a misunderstanding, those are exactly the wrenches in use when bigger pipes are being rotated in and out. the concept may look deceiving, the mechanics work so that the wrenches get tighter when you press on one side. the profile of the jaw is rounded so that it has maximum grip. yes you have to squeeze also but we are talking about a round smoothed surface not about 6 sided nuts, i would not know any other wrenches which have these properties
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