An adjustable wrench is a wrench with an adjustable jaw, allowing it to sized to the fastener head that it is tightening or loosening. A main domestic use is with plumbing fixtures, either to tighten or replace them.
These are for use on nuts where you don't have a wrench of the correct size. Adjustable wrenches are very handy, but can 'round' tight nuts if you are careless. Most technicians use them only as a last resort.
For getting off nuts that people don't have the real wrench for. Many north Americans still can't get used to having metric sizes and i can count on one hand my friends who have, for instance, a 13 mm wrench !
The tool you probably saw was a plumbers wrench. It uses and adjustable metal band to tighten pipes.
A monkey of course! Seriously, a monkey wrench would probably be used mostly by plumbers but anyone could use one as you would use an adjustable wrench. A monkey wrench came along with the original tool kit that came with your new model T or model A Ford way back when. The inventors name as CHARLES MONCKY( that's where the name for the wrench came from
My dad uses a wrench.
The Craftsman Torque Wrench is a wonderful tool to help with the maintenance of one's car. This wrench insures you will get a good grip on the bolts in your car, without ruining anything.
There's a world of difference. A torque wrench is a hand tool used to tighten fasteners to a preset torque specification. An impact wrench is a power tool which uses power actuated hammers to tighten a fastener for high torque applications.
I think that uses a 7mm Allen wrench.
Plumbers use them
It is plumbing or plumber.
Many tradespeople in all facets of industry use wrenches. They are widely used by auto mechanics, aircraft technicians, hydro workers, electricians, plumbers, bicycle mechanics, small engine technicians, truck mechanics, and many other people. Most of us have at least two sets, SAE and Metric wrenches plus an adjustable or crescent wrench. There are many kinds of specialist wrenches too.