Open end wrench, box wrench, gear wrench.
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There are many kinds of wrenches. Perhaps the most common are open end wrenches. Then you have box wrenches, pipe wrenches, adjustable wrenches, combination wrenches and many others.
Typically, no. Stainless steel is a very weak steel compared to other types. Your cheaper socket wrenches will typically be made out of chrome-vanadium. Higher-end models will use some form of tool steel.
Many different people invented different wrenches at widely different times.
ANSWER
All wrenches are steel .