aluminum
background
clean
closeup
cutting
ecology
economy
environmentally
filings
garbage
gray
heap
heavy
industrial
industry
iron
junk
manufacture
manufacturing
material
metal
metallic
metalwork
pile
prepared
process
processed
production
protection
recycle
recycling
reuse
rubbish
rusty
scrap
shavings
shining
steel
texture
textured
trash
waste