abstract
alloy
aluminium
aluminum
background
bar
blank
board
border
brush
burnish
design
durable
frame
grunge
hard
heavy
industrial
industry
iron
line
material
metal
metallic
modern
old
pattern
plate
polish
polished
rivet
riveted
rivets
row
scrape
scratched
scratches
sheet
shield
shine
shiny
silver
smooth
square
stainless
steel
straight
string
style
surface
template
texture
tough