alloy
aluminum
backdrop
background
bar
border
brand
business
chrome
construction
copyspace
design
factory
gray
grunge
hard
heavy
industrial
industry
iron
ironworks
isolated
junk
light
manufacturing
material
metal
metallic
nobody
panel
pattern
plate
polished
production
repetition
shape
silver
stain
stainless
stainless steel
steel
straight
surface
tack
texture
textured
tube
wall
zinc