abstract
alloy
aluminum
background
black
blue
bright
chrome
circle
equipment
gray
grid
grill
grille
hard
heavy
highlight
hole
industrial
industry
instrument
iron
laboratory
material
mesh
metal
metallic
mill
milling
modern
pattern
perforated
plate
reflection
rotor
round
science
sheet
shine
shining
shiny
silver
smooth
stainless
steel
structure
surface
technology
texture