metal rod; metal bar
Refers to a straight, solid piece of metal, typically cylindrical or rectangular in cross-section. Used in construction, manufacturing, and everyday contexts.
They are carrying metal rods at the construction site.
This metal bar is very sturdy.
金属パイプ is a hollow metal pipe, whereas 金属棒 is solid.
Compound of 金属 (metal) and 棒 (rod, bar).