It looka like a peice of metal with a hole in it. I am thinking for a drive shaft maybe?
like Kyle pointed out, A pillow block, with a place to press a bearing in and run a shaft through 
-Arefin.
Square donut? Am I right?
Where is the glazing?
Could that cut out cylinder be large enough to mill a wheel from?
um donuts are good
u guys are going to feel funny after you find what this is
it looks like the outside casing for the gear box.
a non-threaded nut for some kind of aluminum extrusion?
I’m assuming it’s something small because the scratches on it are very big/visible
It looks like something that could hold a pneumatic cylinder for an arm… 
that or a axle