abstract
aluminum
background
chrome
construction
dark
dirt
dirty
engineering
galvanize
galvanized
grey
grunge
hard
hinge
industrial
industry
iron
material
metal
metalic
metallic
old
oxidized
panel
pattern
plate
plated
rivet
rust
rusty
scratch
sheet
shining
shiny
silver
silvery
spot
stain
stainless
steel
strong
surface
texture
textured
tin
tough
weathered
zinc