aluminum
architecture
bar
beam
box
building
bunch
bundle
chrome
construction
cylinder
development
durable
factory
girder
hard
heap
heavy
industrial
industry
iron
joint
joist
material
metal
metallic
objects
painted
pattern
pile
pipe
plate
rectangular
rod
roof
rust
rusted
rusty
site
solid
square
stability
stacked
stainless
steel
storage
structure
support
truss
tube