abstract
alloy
aluminum
armoring
background
board
bolt
border
construction
copy space
design
dirty
frame
gray
gray color
grunge
hard
heavy
horizontal
image
industrial
industry
iron
iron metal
layout
line
material
metal
metallic
military
old
panel
pattern
plate
rivet
rivet work tool
screw
sheet
shiny
silver
solid
stainless
steel
surface
template
texture
textured
wall