Zinc Metal Ball : United Nuclear , Scientific Equipment & Supplies, United Nuclear , Scientific Equipment & Supplies
One Large 4" Inch Chrome Solid Steel Bearing Ball G100: Amazon.com: Industrial & Scientific
Pre-drilled Solid Steel Balls - 30-814 [30-814] : Custom Iron Works, Best Stair Railings and Gate Parts on the Net!
2" Diameter Ball - King Architectural Metals
Customized G20-G1000 Small Carbon Steel Ball Bearing Ball Solid Metal Ball for Bicycle/Cast/Rail/Drawer Slide/Valve/Wheel Caster - China Rail, Cast | Made-in-China.com
I found this heavy solid metal ball in a field 5 years ago the only thing I can think it might be is a ball bearing for some heavy machinery : r/whatisthisthing