Very large Angle finder, compass, dividers, protractor
Call it what you will I call it handy for measuring , marking or determining the angle of things way too large for normal sized tools.
I made this out of a couple pieces of 1/8 by 2" flat bar a couple of years ago and found it today while looking for a drill chuck
Never try to tell me it can't be done
When I have to paint I use KBS products