bar
brown
building
built
bunch
bundle
concrete
construct
construction
corrosion
cylinder
durable
engineering
equipment
factory
ferrous
group
heap
heavy
industrial
industry
iron
macro
manufacture
materials
metal
metallic
objects
old
part
pile
piling
plant
rails
rebar
reinforced
rod
rough
rust
sheaf
stack
steel
stock
storage
storehouse
technological
technology
warehouse
weathered