abstract
alloy
backdrop
background
bright
chrome
close
closeup
construction
curve
design
dirty
edge
engineering
focus
grate
grater
gray
grunge
hard
industrial
iron
kitchen
macro
material
mesh
metal
metallic
nobody
panel
pattern
reflection
reflective
rough
sharp
sheet
shine
shiny
silver
stainless
steel
strength
surface
texture
textured
titanium
tool
tough
up