@gavvet I'm a little jealous of your ability to find artifacts like these.
I'm lucky to find an old beer can.
What I find interesting is that the tools were obviously made to fit a hand of approximately the same size as our hands now. (Although obviously not nearly as soft and tender as most humans hands have become.)
If they are tens or hundreds of thousands of years old, does that indicate that the size and shape of our hands have been deemed relatively optimum in evolutionary terms?
Some do fit more comfortably in larger hands, others in smaller...
Hand size is a function of body size and is usually determined by nutrition, diet and robustness requirements of the environment.
Body shapes and sizes have varied widely throughout the evolutionary family tree, as they do today, where we have 4 ft and less to 7 ft or more individuals.
These are often related to race and geographical distribution today, which is a result of isolation under a certain set of conditions over very long periods.