What is mesh? I know what i think what mesh and it would not make a very strong wrench notice the price
https://marketplace.secondlife.com/p/Antique-adjustable-wrench/4183573?id=4183573&slug=Antique-adjustable-wrench
Bob, he is selling computer generated image files for art or design work, perhaps for computer game developers. That is not a real wrench.
First thing I thought of was the 3D printer that is being used to make car parts and even working pistols. Not sure if it would be strong enough for a wrench, but if it is carbon fiber, who knows.
Second Life is a very strange and large-scale computer game that people can create their own stuff for. If you are good with a computer, you can make whatever you want I think. Crappy graphics and no plot.